Quantum cryptography makes use of the quantum-mechanical behavior of nature for the design and analysis of cryptographic schemes. Optimally (but not always), quantum cryptography allows for the design of cryptographic schemes whose security is guaranteed solely by the laws of nature. This is in sharp contrast to standard cryptographic schemes, which can be broken in principle, i.e., when given sufficient computing power. From a theory point of view, quantum cryptography offers a beautiful interplay between the mathematics of (...) adversarial behavior and quantum information theory. In this review article, we discuss the traditional application of quantum cryptography, quantum key distribution (QKD), from a modern perspective, and we discuss some recent developments in the context of quantum two-party cooperation (2PC). QKD allows two distant parties to communicate in a provably-secure way in the presence of an outside eavesdropper, whereas 2PC is concerned with protecting information against possibly malicious insiders. We show the basic idea of constructing quantum cryptographic schemes, but we also show some connections to quantum information theory as needed for the rigorous security analyses, and we discuss some of the relevant quantum-information-theoretic results. (shrink)

Modern cryptography normally assumes that the analytical domain has already been established: messages and ciphertexts are represented through stable alphabets, dictionaries, object boundaries, and cross-session identity relations. This paper introduces Post-Alphabet-Dictionary Cryptography (PADC), a framework in which the formation of those analytical spaces becomes part of the protected architecture. -/- PADC distinguishes three levels of controlled non-equivalence: symbol identity, dictionary distribution, and cryptographic-object structure. Repeated source units need not preserve stable external identities; observable statistical profiles need not preserve (...) the source dictionary; and visible carrier segmentation need not determine the internal structure of a cipher, hash, signature, or other cryptographic object. -/- The paper constructs cases in which one observable sequence remains compatible with multiple mutually incompatible cryptographic-object spaces. Language Segment Encoding (LSEG) is presented as a candidate structural carrier that preserves observable synchronization while leaving higher-level object assembly dependent on a hidden representational state. -/- The analysis is extended across sessions. If each session forms a distinct observable alphabet and dictionary, cross-session statistical accumulation requires prior reconstruction of the mappings that identify units across those spaces. Thus, additional observations do not automatically form one enlarged statistical corpus. -/- Four architectural properties are proposed: Representational Space Non-Uniqueness, Structural Ambiguity Preservation, Architectural Non-Stabilizability, and Cross-Session Analytical Decorrelation. The resulting thesis is that cryptographic analysis presupposes a stable alphabet, dictionary, message space, and cryptographic-object space; PADC places the formation of those spaces within the security boundary. (shrink)

Introduction: silence and secrecy -- Symptoms -- Cryptography -- Cryptomnesia -- Fact or fiction -- Cryptosemiotician -- Tentative conclusion -- Appendix: list of coded passages from Wittgenstein's Nachlass.

As we move our social institutions from paper and ink based operations to the electronic medium, we invisibly create a type of surveillance society, a panopticon society. It is not the traditional surveillance society in which government officials follow citizens around because they are concerned about threats to the political order. Instead it is piecemeal surveillance by public and private organizations. Piecemeal though it is, It creates the potential for the old kind of surveillance on an even grander scale. The (...) panopticon is the prison environment described by Foucault in which prison cells are arranged in a large circle with the side facing the inside of the circle open to view. The guard tower is placed in the middle of the circle so that guards can see everything that goes on in every cell. When we contemplate all the electronic data that is now gathered about each of us as we move through our everyday lives --- intelligent highway systems, consumer transactions, traffic patterns on the internet, medical records, financial records, and so on --- there seems little doubt that we are moving into a panopticon. The social issues that arise from this are too numerous to detail here, but data retention is an important part of it. In the paper-and-ink world, documents are filed, files are boxed, boxes are put away or thrown away. The capacity for data retrieval and manipulation is, thereby, limited by the sheer difficulty and cost of storing, finding, searching, and manipulating large numbers of paper files. This inconvenience functions as a mechanism whereby the system forgets past information, not unlike the way we ourselves forget. However, the story is very different in the digital world; digital information is easy to store, easy to search and manipulate, and inexpensive to keep over extensive periods of time. Digitalized information systems tend, therefore, to collect extensive ancillary information and to retain this information indefinitely. Such lack of forgetfulness is likely to hamper the ability of individuals to shed their past, and start over with a clean slate. Concerns about data retention were expressed in the early literature on the social impact of computing, but for the most part the issue has dropped from sight. Rarely, has the social good of discarding accumulated personal data been addressed. In this paper, we want to make the case by examining diverse cases in which retention of information by either business or governmental institutions hinders the ability of individuals to start over or to act autonomously. We hope our argument for the good of forgetfulness will challenge the standard framework in which such issues have traditionally been debated. The privacy debate exemplifies the traditional framework insofar as it has been characterized as involving an inherent tension between, on the one hand, the needs of organizations and institutions for more accurate and efficient information systems so as to further their goals and, on the other hand, the desire of individuals to have information about them kept private. Regan argues against this framing of the privacy issue in favor of one that recognizes the social importance of personal privacy. We will examine the non-forgetfulness of information systems as a problem threatening not just individual interests but social good as well. Cryptography is often cited as the technology that will give us privacy and mediate against surveillance. One of the uses of cryptography, encryption, will allow us, some hope, to create confidentiality and relationships of trust that will facilitate many of the social arrangements we now have and perhaps make them even more secure than they are now. Electronic cash, for example, could be created in such a form that it would have the anonymity associated now with hard cash Others are less optimistic of the potential for cryptography to re-create relationships of trust in the new medium. One important point that already seems clear is that even if encryption technology will protect the confidentiality and integrity of electronic transactions and data, it will NOT stop the observation of traffic patterns on networks. This seems an important distinction to put on the table. Our patterns of communication will continue to be available, no matter what is encrypted, and an amazing amount of information can be gleaned from this data. In a sense, it means content integrity but no anonymity. This will indubitably impact how we interact and with whom we interact. (shrink)

In Part 1 of this short book, Rescher provides an overview of the nature and source of Leibniz’s interest in the theory and practice of cryptanalysis, including his unsuccessful bid to secure an apprentice for John Wallis (1616-1703) with a view to perpetuating the Englishman’s remarkable deciphering abilities. In Part 2, perhaps the most interesting part of the book, Rescher offers his account of the inner workings of Leibniz’s cipher machine. Part 3 provides a brief pictorial history of such machines (...) and related technologies. Finally, in Part 4 Rescher analyzes some of Leibniz’s own relatively scant attempts at decryption. Though there is little of direct philosophical interest in this work, its account of Leibniz’s forays into the field of encryption and in particular its reconstruction of his remarkable machine are fascinating and should hold considerable appeal for those interested in Leibniz’s pursuits more broadly and in the histories of cryptography and machine design. (shrink)

Visual cryptography is a cryptographic technique that allows visual information to be encrypted so that the human optical system can perform the decryption without any cryptographic computation. The halftone visual cryptography scheme (HVCS) is a type of visual cryptography (VC) that encodes the secret image into halftone images to produce secure and meaningful shares. However, the HVC scheme has many unsolved problems, such as pixel expansion, low contrast, cross-interference problem, and difficulty in managing share images. This article (...) aims to enhance the visual quality and avoid the problems of cross-interference and pixel expansion of the share images. It introduces a novel optimization of color halftone visual cryptography (OCHVC) scheme by using two proposed techniques: hash codebook and construction techniques. The new techniques distribute the information pixels of a secret image into a halftone cover image randomly based on a bat optimization algorithm. The results show that these techniques have enhanced security levels and make the proposed OCHVC scheme more robust against different attacks. The OCHVC scheme achieves mean squared error (MSE) of 95.0%, peak signal-to-noise ratio (PSNR) of 28.3%, normalized cross correlation (NCC) of 99.4%, and universal quality index (UQI) of 99.3% on average for the six shares. Subsequently, the experiment results based on image quality metrics show improvement in size, visual quality, and security for retrieved secret images and meaningful share images of the OCHVC scheme. Comparing the proposed OCHVC with some related works shows that the OCHVC scheme is more effective and secure. (shrink)

In this text we discuss how power, mathematics and cryptography establish dialogues that are considered critical for the present, but which have influence from the past and concerns for the future. We contextualize our reflections from a historical perspective, especially in the Brazilian context, and advance the debates about how cryptography, based on mathematical theories, influenced and dynamized wars. Going a little beyond this historical context, we present some reflections concerning the role of cryptography as a means (...) of data security, one of the main discussions in contemporary society. In this reflection, we point out the position of power that the holders of this knowledge occupy, and that, in the scope of basic school, lacks important discussions for both teachers and students. (shrink)

Smart grids are designed to revolutionize the energy sector by creating a smarter, more efficient and reliable power supply network. The rise of smart grids is a response to the need for a more comprehensive and sophisticated energy system that caters to the needs of homes and businesses. Key features of smart grids include the integration of renewable energy sources, decentralized generation and advanced distribution networks. At the heart of smart grids is a sophisticated metering system, consisting of intelligent electronic (...) devices that measure energy consumption and enable two-way communication between the utility company and the consumer. The information exchanged via these devices is critical, as it includes sensitive data such as energy consumption patterns and billing information. With the rise of the Internet of Things (IoT) and Industry 4.0, the security of this information is of utmost importance. This paper delves into the security challenges faced by advanced metering infrastructure (AMI) and highlights the crucial role played by cryptography in ensuring the secure exchange of sensitive information. Cryptographic protocols such as encryption, authentication and digital signatures are essential components of a secure smart grid infrastructure. These protocols work together to ensure the confidentiality, integrity and authenticity of the information exchanged between the utility company and the consumer. (shrink)

In an undated letter, Peirce claims that he can make a machine that will automatically encrypt and decrypt messages, an astonishing claim considering the state of American science during his time. In two undated manuscripts, Peirce actually describes a cryptosystem, a system for encrypting and decrypting, suggesting the use of arithmetical transformations and binary notation. The relationship between the manuscripts and the letter are discussed in the paper. The paper also describes Peirce’s cryptosystem, places it in its historical context and (...) assesses its comparative value. The paper ends with speculations on whether Peirce could really have built the machine. Considering that he understood the relationship between electricity, binary arithmetic, and Boolean logic, and was familiar with the experiences on the logical machines of his time, the paper concludes that Peirce had all the knowledge necessary to build such a machine. (shrink)

Book review r A. (2004). "Book review: Yves nievergelt, foundations of...

Code-based cryptography is currently the second most promising post-quantum mathematical tool for quantum-resistant algorithms. Since in 2022 the first post-quantum standard Key Encapsulation Mechanism, Kyber (a latticed-based algorithm), was selected to be established as standard, and after that the National Institute of Standards and Technology post-quantum standardization call focused in code-based cryptosystems. Three of the four candidates that remain in the fourth round are code-based algorithms. In fact, the only non-code-based algorithm (SIKE) is now considered vulnerable. Due to this (...) landscape, it is crucial to update previous results about these algorithms and their functioning. The Fujisaki-Okamoto transformation is a key part of the study of post-quantum algorithms and in this work we focus our analysis on Classic McEliece, BIKE and HQC proposals, and how they apply this transformation to obtain IND-CCA semantic security. Since after security the most important parameter in the evaluation of the algorithms is performance, we have compared the performance of the code-based algorithms of the NIST call considering the same architecture for all of them. (shrink)

A hypergroup, as a generalization of the notion of a group, was introduced by F. Marty in 1934. The first book in hypergroup theory was published by Corsini. Nowadays, hypergroups have found applications to many subjects of pure and applied mathematics, for example, in geometry, topology, cryptography and coding theory, graphs and hypergraphs, probability theory, binary relations, theory of fuzzy and rough sets and automata theory, physics, and also in biological inheritance.

Cooperative, connected and automated mobility technologies have the potential to revolutionize transportation systems and enhance safety, efficiency and sustainability. However, the increasing reliance on digital technologies also introduces new cybersecurity risks that can compromise the safety and privacy of passengers and the integrity of transportation systems. The purpose of this article is to examine the most important threats, vulnerabilities, risks and challenges related to automated mobility and to review the status of the most promising standardization initiatives on cryptography in (...) a world where quantum computers will soon represent an actual threat. (shrink)

The advent of quantum computing will compromise current asymmetric cryptography. Awaiting this moment, global superpowers are routinely collecting and storing encrypted data, so as to later decrypt it once sufficiently strong quantum computers are in place. We argue that this situation gives rise to a new mode of global surveillance that we refer to as a quantum panopticon. Unlike traditional forms of panoptic surveillance, the quantum panopticon introduces a temporal axis, whereby data subjects’ future pasts can be monitored from (...) an unknown “superposition” in the quantum future. It also introduces a new level of uncertainty, in that the future watchman’s very existence becomes a function of data subjects’ efforts to protect themselves from being monitored in the present. Encryption may work as a momentary protection, but increases the likelihood of long-term preservation for future decryption, because encrypted data is stored longer than plaintext data. To illustrate the political and ethical aspects of these features, we draw on cryptographic as well as theoretical surveillance literature and call for urgent consideration of the wider implications of quantum computing for the global surveillance landscape. (shrink)

Central to pragmatist naturalism is understanding experience as an embodied engagement within an environment. Also, social and participative relationships are embodied in locally shared experience and imaginaries. As notions of embodiment become mainstream, we are facing a trend that could render them obsolete. Humans begin to inhabit regions of the metaverse as disembodied avatars. They leave their physical identities behind to become tokenized actants in crypto worlds. Participative relationships suffer the same fate: public-key cryptography offers instruments that compete with (...) analogue governance institutions, such as fiat money, personal identity, and intellectual property. This paper turns to science and technology studies and actor-network theory to translate classical pragmatist ideas to these new digital lifeworlds. Not only does this reveal the residual connection of digital worlds with physically embodied experience, it also invites the search for new participative relationships that may include human and non-human actants on a more equal footing. (shrink)

The continuous development of information communication technology facilitates the conventional grid in transforming into an automated modern system. Internet-of-Things solutions are used along with the evolving services of end-users to the electricity service provider for smart grid applications. In terms of various devices and machine integration, adequate authentication is the key to an accurate source and destination in advanced metering infrastructure (AMI). Various protocols are deployed to lead the identification between two parties, which require high computation time and communicational bit (...) operations for system development. Therefore, Kerberos-based authentication protocols were designed in this study with the assistance of elliptic curve cryptography to manage the mutual authentication between two parties and reduce the time and bit operations. The protocols were evaluated in a widely adopted tool, AVISPA, which builds an understanding of the proposed protocol and ensures mutual authentication without unauthorized knowledge. In addition, upon comparing security and performance assessments to the current schemes, it was found that the protocol in this study required less time and bits to transmit information. Consequently, it effectively provides multiple security features making it suitable for resource constraint smart meters in AMI. (shrink)

Julian Assange, the founder of WikiLeaks, has been studied as a hacker, a journalist and an activist, but scholars have not given sufficient attention to his broader ethical theory. Assange’s cypherpunk ethics emphasises justice while advocating the widespread use of digital cryptography to defend individual privacy and promote institutional transparency. This paper places Assange’s cypherpunk ethics into conversation with contemporary global media ethics through a comparative study with the ethical theory of Clifford Christians. Christians and Assange offer different foundations (...) for metaethics, and these differences give shape to their respective conceptions of cosmopolitanism, their divergent critiques of professional journalism and advocacy for convivial tools. By bringing a non-academic like Assange into the conversation, this paper practices ethical listening as a part of open media ethics, establishes a descriptive account of Assange’s ethical theory and introduces a justice-centred ethical paradigm into the field of global media ethics. (shrink)

It is generally assumed that electronic cryptography benefits democracy because it can be instrumental in protecting free speech, which is considered a cornerstone for democracy. The author argues, however, that a close look at some aspects of democratic theory suggests that matters are not really as clear-cut. The fact that encryption can be abused in many ways also poses a threat to democracy. This paradox is examined in detail.

Modern cryptography is commonly analyzed within computational or information-theoretic frameworks that implicitly assume the existence of a stable alphabet and persistent symbol identity at the level of ciphertext. Statistical analysis, entropy estimation, and even perfect secrecy in the Shannon sense presuppose that repeated symbolic units can be identified, compared, and counted. This assumption, however, is rarely stated explicitly and is typically treated as a technical given rather than examined as an epistemic condition. In this paper, we examine a conceptual (...) boundary case in which this assumption fails, and alphabet formation itself does not occur for an external observer. We consider communication models based on non-canonical encoding, where each symbol of the source alphabet is mapped not to a single codeword but to a large set of equally admissible representations, with no fixed correspondence preserved across occurrences. In such models, the identity of ciphertext symbols is not stabilized, and no consistent ciphertext alphabet emerges for an external observer. We argue that in the absence of alphabet formation, standard tools of cryptographic analysis—including frequency statistics, pattern recognition, entropy measures, and known-plaintext attacks—do not merely become ineffective but fail to be well-defined. From an epistemic perspective, the problem is not insufficient complexity or noise but the non-existence of symbolic units required for interpretation. The observed signal remains indistinguishable from non-signifying physical variation. This analysis clarifies a conceptual distinction between secrecy within an established symbolic framework and a stronger boundary case that may be described as non-recognizability, where no symbolic framework arises for the observer. We show how this distinction sheds light on historical cryptographic failures, limitations of statistical and AI-based decoding approaches, and the scope of information-theoretic security. The results do not propose a new cryptographic algorithm but instead delineate a fundamental limit on what cryptographic analysis can presuppose. (shrink)

: Lately there is more attention paid to technological development in intelligent tutoring systems. This field is becoming an interesting topic to many researchers. In this paper, we are presenting an intelligent tutoring system for teaching DES Information Security Algorithm called DES-Tutor. The DES-Tutor target the students enrolled in cryptography course in the department Information Technology in Al-Azhar University in Gaza. Through DES-Tutor the student will be able to study course material and try the exercises of each lesson. An (...) evaluation of the DES-Tutor was carried out and the results were promising. (shrink)

A dizzying trip through the mind(s) of the provocative and influential thinker Nick Land. During the 1990s British philosopher Nick Land's unique work, variously described as “rabid nihilism,” “mad black deleuzianism,” and “cybergothic,” developed perhaps the only rigorous and culturally-engaged escape route out of the malaise of “continental philosophy” —a route that was implacably blocked by the academy. However, Land's work has continued to exert an influence, both through the British “speculative realist” philosophers who studied with him, and through the (...) many cultural producers—writers, artists, musicians, filmmakers—who have been invigorated by his uncompromising and abrasive philosophical vision. Beginning with Land's early radical rereadings of Heidegger, Nietzsche, Kant and Bataille, the volume collects together the papers, talks and articles of the mid-90s—long the subject of rumour and vague legend (including some work which has never previously appeared in print)—in which Land developed his futuristic theory-fiction of cybercapitalism gone amok; and ends with his enigmatic later writings in which Ballardian fictions, poetics, cryptography, anthropology, grammatology and the occult are smeared into unrecognisable hybrids. Fanged Noumena gives a dizzying perspective on the entire trajectory of this provocative and influential thinker's work, and has introduced his unique voice to a new generation of readers. (shrink)

Quantum physics, which offers an explanation of the world on the smallest scale, has fundamental implications that pose a serious challenge to ordinary logic. Particularly counterintuitive is the notion of entanglement, which has been explored for the past 30 years and posits an ubiquitous randomness capable of manifesting itself simultaneously in more than one place. This amazing 'non-locality' is more than just an abstract curiosity or paradox: it has entirely down-to-earth applications in cryptography, serving for example to protect financial (...) information; it also has enabled the demonstration of 'quantum teleportation', whose infinite possibilities even science-fiction writers can scarcely imagine. This delightful and concise exposition does not avoid the deep logical difficulties of quantum physics, but gives the reader the insights needed to appreciate them. From 'Bell's Theorem' to experiments in quantum entanglement, the reader will gain a solid understanding of one of the most fascinating areas of contemporary physics. (shrink)

Using different quantum states (e.g., two mode squeezed-state, multipartite GHZ-like-states) as quantum resources, two protocols for "continuous variable (CV) controlled quantum conference" are proposed. These CV protocols for controlled quantum conferences (CQCs) are the first of their kind and can be reduced to CV protocols for various other cryptographic tasks. In the proposed protocols, Charlie is considered the controller, having the power to terminate the protocol at any time and to control the flow of information among the other users by (...) using a parameterised control switch. Based on the information shared by Charlie with the participants of the conference, the control power of Charlie is evaluated and compared to the proposed protocols. The comparison of the efficiency of the proposed protocols has revealed that, under certain constraints, the 4-mode GHZ state-based protocol is more efficient than the two-mode squeezed state-based protocol. The control power Charlie is evaluated for the proposed protocols under certain constraints. A security analysis is also performed, and it is observed that the proposed protocols are secure against a variety of attacks, including but not limited to disturbance attacks, man-in-the-middle attacks, Trojan horse attacks, laser seeding attacks, cloning attacks, beam splitter attacks, and malicious user(s) attacks. (shrink)

In the bitcoin whitepaper, Satoshi Nakamoto (2008: 2) defines an electronic coin as a chain of digital signatures. Many have since defined a bitcoin as a chain of digital signatures. This latter definition continues to appear in reports from central banks, advocacy centers, and governments, as well as in academic papers across the disciplines of law, economics, computer science, cryptography, management, and philosophy. Some have even used it to argue that what we now call bitcoin is not the real (...) bitcoin. The definition fails, however. This is important because the Chain Definition obscures Satoshi’s solution to a dilemma in the design of electronic cash, as well as the truth about bitcoin’s privacy and fungibility. In this article, I explain why the Chain Definition fails and what Satoshi likely endorsed instead. Along the way, I untangle some issues around bitcoin fungibility and clarify some others around the ontology of digital assets. (shrink)

Quantum computing represents a paradigm shift in computation, leveraging the principles of superposition and entanglement to perform tasks beyond the reach of classical computers. This paper provides an overview of key quantum algorithms, including Shor’s algorithm for integer factorization, Grover’s search algorithm, and quantum simulation techniques. It discusses their underlying principles, computational advantages, and practical implications across fields such as cryptography, optimization, and material science. Additionally, the paper examines the current challenges in implementing these algorithms on existing quantum hardware (...) and explores future directions for enhancing their efficiency and scalability. Overall, this study highlights the transformative impact of quantum algorithms on modern computing and their potential to redefine problem-solving in science and industry. (shrink)

The distinction between the discrete and the continuous lies at the heart of mathematics. Discrete mathematics (arithmetic, algebra, combinatorics, graph theory, cryptography, logic) has a set of concepts, techniques, and application areas largely distinct from continuous mathematics (traditional geometry, calculus, most of functional analysis, differential equations, topology). The interaction between the two – for example in computer models of continuous systems such as fluid flow – is a central issue in the applicable mathematics of the last hundred years. This (...) article explains the distinction and why it has proved to be one of the great organizing themes of mathematics. (shrink)

In unconditionally secure protocols, a sender and receiver are able to communicate their secrets to each other without the eavesdropper(s) being able to learn the secret, even when the eavesdropper intercepts the entire communication. We investigate such protocols for the special case of deals of cards over players, where two players aim to communicate to each other their hand of cards without the remaining player(s) learning a single card from either hand. In this contribution we show that a particular protocol (...) of length strictly larger than two (i.e., consisting of more than just one announcement by one player, and one other announcement by the other player) is after all not acceptable, and therefore does not constitute a new solution. The demonstration requires a detailed case-based analysis. The result may bring a general approach to arbitrary finite-length protocols closer. (shrink)

Providing Single Sign-On (SSO) between service providers and enabling service providers to share user personal attributes are critical for both users to benefit from a seamless access to their services, and service providers to realize new business opportunities. Today, however, the users have several independent, partial identities spread over different service providers. Providing SSO and attribute sharing requires that links (federations) are established between (partial) identities. In SAML 2.0 (Maler et al. 2003), the links between identities are stored and managed (...) at the network side by the identity providers (network-side identity federation). This model prevents the service providers from mass-correlating the partial identities they have, but the users must fully trust the identity providers. In this paper, we propose a complementary approach where the users have a full control of the links between their partial identities. It is a client-side identity federation approach, which relies on the introduction of a new cryptographic tool, called invariable partially blind signature scheme, that may be of independent interest. (shrink)

Language planning comprises a number of different though related aspects of linguistic activity, its proper realm ranging from the 'improvement' of existing ...

A Principled Limitation of Wolfram's Computational Irreducibility for Finite Unitary Quantum Systems. The sufficiency of a single slice to predict the entire evolution. -/- After diagonalization, prediction cost is independent of the time horizon. -/- Time is not a fundamental step-by-step process—it emerges from the spectrum of the evolutionary operator. Therefore, the "future" is not ontologically inaccessible: it is already fully encoded in the spectral structure of the present. Computational reducibility is not a trick involving substitution into a formula. It (...) reflects the fact that in Quantumograph, time and spectrum are the same thing, described in different languages. -/- Implications and Practical Outlook. The main consequence is not a universal cryptanalytic breakthrough, but a precise separation between principled and operational predictability. Exact microstate prediction remains exponentially costly, whereas coarse-grained observables admit polynomial forecasting. This makes the framework relevant for model reduction, spectral inference, and device-level analysis, while the cryptographic threat landscape remains governed by dedicated quantum algorithms and by the ongoing transition to post-quantum cryptography. (shrink)

Information theory traditionally begins with messages represented as sequences of symbols drawn from an alphabet. The existence of such alphabets is usually treated as a primitive assumption. This paper argues that alphabets are not primitive objects but derived structures emerging from a deeper hierarchy. We propose the dependency chain Language → Dictionary → Alphabet → Message → Information and examine its consequences for information theory and cryptography. Languages establish systems of distinctions, dictionaries stabilize those distinctions, alphabets provide symbolic representations, (...) and messages emerge as sequences of alphabetic projections. Information therefore appears not as a foundational entity but as the result of prior processes of symbolic stabilization. This perspective reveals a hidden assumption shared by information theory and cryptography: the existence of an observable alphabet. The paper discusses the implications of this observation and outlines its relevance for future research on alphabet formation, cryptographic interpretation, and post-alphabetic communication systems. (shrink)

This paper introduces a universal Meta-Language framework that integrates human, mathematical, programming, and animal languages across time. Each linguistic unit (word) is modeled as a topological knot with a fingerprint and an associated Seifert surface, embedded within a cryptographically committed graph. Using zero-knowledge proofs (ZKPs), we demonstrate that every word either reaches a designated conceptual region or faces extinction. Leveraging Zeckendorf's theorem, we establish that embedding matrices derived from Seifert surfaces can be uniquely represented in Fibonacci dimensions, providing a structured (...) and scalable growth pattern for semantic embeddings. Additionally, we present a new theorem on Meta-Language Completeness & Byzantine Resolution, asserting that practical completeness of a language requires a Byzantine-resilient consensus mechanism enacted in response to endogenous linguistic desire. -/- To make the dense interplay of topology, cryptography, and linguistics more accessible, we include step-by-step examples (e.g., modeling "love" as a trefoil knot) and simple visualizations throughout. (shrink)

This paper considers the potential impact that the nascent technology of quantum computing may have on society. It focuses on three areas: cryptography, optimization, and simulation of quantum systems. We will also discuss some ethical aspects of these developments, and ways to mitigate the risks.

The advent of quantum computing will compromise current asymmetric cryptography. Awaiting this moment, global superpowers are routinely collecting and storing encrypted data, so as to later decrypt it once sufficiently strong quantum computers are in place. We argue that this situation gives rise to a new mode of global surveillance that we refer to as a _quantum panopticon._ Unlike traditional forms of panoptic surveillance, the quantum panopticon introduces a _temporal axis_, whereby data subjects’ future pasts can be monitored from (...) an unknown “superposition” in the quantum future_._ It also introduces a new level of _uncertainty,_ in that the future watchman’s very existence becomes a function of data subjects’ efforts to protect themselves from being monitored in the present. Encryption may work as a momentary protection, but increases the likelihood of long-term preservation for future decryption, because encrypted data is stored longer than plaintext data. To illustrate the political and ethical aspects of these features, we draw on cryptographic as well as theoretical surveillance literature and call for urgent consideration of the wider implications of quantum computing for the global surveillance landscape. (shrink)

In this paper, we propose a method to design the pseudorandom number generator using three kinds of four-wing memristive hyperchaotic systems with different dimensions as multientropy sources. The principle of this method is to obtain pseudorandom numbers with good randomness by coupling XOR operation on the three kinds of FWMHSs with different dimensions. In order to prove its potential application in secure communication, the security of PRNG based on this scheme is analyzed from the perspective of cryptography. In addition, (...) PRNG has passed the NIST 800.22 and ENT test, which shows that PRNG has good statistical characteristics. Finally, an image encryption algorithm based on PRNG is adopted. In the encryption algorithm, the optimized Arnold matrix scrambling method and the diffusion processing based on XOR are used to obtain the final encrypted image. Through the evaluation of encryption performance, it is concluded that there is no direct relationship between the pristine image and encrypted image. The results show that the proposed image encryption scheme has good statistical output characteristics and security performance in line with cryptography. (shrink)

We propose a novel cryptographic framework leveraging quotient space mappings of space-time configurations. By exploiting equivalence classes derived from spatial and temporal projections, our method embeds cryptographic keys into redundant space-time channels, enabling fault-tolerant and secure communication. Unlike traditional cryptography, which relies on computational hardness or quantum properties, our approach uses topological redundancy to protect against interception and channel corruption. The framework is particularly suited for deep-space communication, where delays and lack of synchronized references challenge conventional methods. Applications include (...) interplanetary messaging, enhanced quantum key distribution, and distributed data storage. (shrink)

Quantum theory is one the most important and successful theories of modern physical science. It has been estimated that its principles form the basis for about 30 per cent of the world's manufacturing economy. This is all the more remarkable because quantum theory is a theory that nobody understands. The meaning of Quantum Theory introduces science students to the theory's fundamental conceptual and philosophical problems, and the basis of its non-understandability. It does this with the barest minimum of jargon and (...) very little mathematics in the main text. Readers wishing to delve more deeply into the theory's mathematical subtleties can do so in an extended series of appendices. The book brings the reader up to date with the results of new experimental tests of quantum weirdness and reviews the latest thinking on alternative interpretations, the frontiers of quantum cosmology, quantum gravity and potential application of this weirdness in computing, cryptography and teleportation. (shrink)