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I'm Henrich C. Pöhls.

IT-Security Researcher, I love standards and think Integrity matters.

Picture Portrait of Henrich C. Poehls

Henrich C. Pöhls


Dr. Henrich C. Pöhls is an information security researcher and lecturer at the University of Passau specialising in securing AI-Systems and using cryptographic methods for data authenticity. Currently, he is a co-principal investigator in the Bavarian ForDaySec project, focusing on architectures and services for secure digitalisation of everyday life. Through his interdisciplinary work, he aims to create secure and legally compliant digital environments for everyday use.
Henrich C. Pöhls was holding the Assistant Professorship of Security in Information Systems from April till August 2021 and researches and teaches the application and development of information security concepts on systems, especially the security of systems that deploy artificial intelligence as well as the general use of cryptographically secure mechanisms for the protection of authenticity of data while it traverses an IT-system.

Henrich C. Pöhls received his PhD. from University of Passau for his work on the interdisciplinary (cryptography and law) topic of Increasing the Legal Probative Value of Cryptographically Private Malleable Signatures. In this work he analysed the practical applications and legal implications of an advanced digital signature schemes, known as malleable signatures. In short, malleable signatures allow to specify and authorise subsequent modifications of signed documents. If the policy for subsequent modification is obliged to, the original signer's signature still verifies as valid on the modified document. This allows among other applications to carry out privacy-preserving modification, e.g. blackening out to conform to EU GDPR regulation, on signed documents while upholding the authenticity given by the digital signature for the remaining contents of the document. He showed in his phd thesis that the technical protection of the newly proposed cryptographic signature schemes allows to argue that they achieve the highest security level necessary for so-called qualified electronic signatures following EU eIDAS regulation. Thus those newly proposed malleable signatures give the documents signed there-with legal and thus also economical value.

Henrich C. Pöhls has authored and co-authored many academic publications, especially on the topic of tailoring cryptographic signature primitives for making them legally compliant and making their privacy enhancing features suitable for an application in various domains ranging from supply chain documents, to data from the Internet-of-Things, to the cloud. He is keen on interdisciplinary work especially in the field of cryptography, software development and law, as he thinks the more gaps between those three worlds can be bridged the more sound (=safe, secure and legally compliant) ICT-enhanced products and environments like smarthomes or smartcities become.

Henrich C. Pöhls also holds a graduate diploma in computer science (Dipl. Inf.) from the University of Hamburg and an M.Sc. in Information Security from Royal Holloway University of London.

Henrich C. Pöhls currently researches and teaches an M.Sc. class on Secure AI Systems. Previously he was also teaching the Advanced IT Security lecture as well as many exercises, labs, and projects in the IT Security curriculum. During the lecture and exercises he draws on a long experience as a research & teaching assistant to Prof. Joachim Posegga, from 2004 at University of Hamburg and since 2008 at the University of Passau. During that time, he devised and also delivered for many years a hands-on class at university and was teaching students how to apply theoretic concepts of computer and information security in practice.

Henrich C. Pöhls has successfully participated and lead collaborative research projects with academic and industrial partners on national as well as European/international level.

For example, most recently:

Henrich C. Pöhls is currently the editor, respectively co-editor, of two international standards projects:

Academic Publications and Activities


Latest Publications

  • Z. Benenson, D. Eckhardt, F. Freiling and H. C. Pöhls. Disciplines Are Not the Enemy: Three Insights from an Interdisciplinary Project on Everyday Security. In Festschrift in Honour of M. Angela Sasse, March, 2026. doi...  pdf... 
  • Pöhls, H. C. and Marktscheffel, T. LightSafeAuth: Authentication during key-establishment for IoT devices via visible optical light bursts. In Open Identity Summit 2026, pages 263-272, Gesellschaft für Informatik e.V., May, 2026.  This is a pre-print; full text available under DOI. doi...  pdf... 
  • H. C. Pöhls and C. J. Mitchell, Ed. Proc. of the 10th International Security Standardisation Research Conference (SSR 2025). doi... 
  • H. C. Pöhls and L. Steffens. Checking the Impact of Security Standardization - A Case Study on Bluetooth LE Pairing of Internet-of-Things Devices. In ICT Systems Security and Privacy Protection - 40th IFIP SEC Conference, pages 49-63, Springer, May, 2025.  This is a preprint. doi...  pdf... 
  • H. C. Pöhls, F. Kügler, E. Geloczi and F. Klement. Segmentation and Filtering Are Still the Gold Standard for Privacy in IoT -- An In-Depth STRIDE and LINDDUN Analysis of Smart Homes. In Future Internet, 1 (1): 77-138, Feb, 2025.  Submitted: 20 December 2024 doi...  paper... 
  • H. C. Pöhls, D. Eckhardt, N. Feist, S. Pfeiffer, D. Herrmann and S. Katzenbeisser. The Complexity of Cyber Security in Private and Professional Everyday Life --- An Ethnographic-Informatic Collaborative Approach. In Proceedings of the 27th International Conference on Human-Computer Interaction (HCII 2025), pages 105-124, Springer, Jul., 2025.  This is a pre-print. Final paper will appear in Springer series "HCII (International Conference on Human-Computer Interaction)" doi...  pdf... 
  • E. Geloczi, N. Mexis, B. Holler, H. C. Pöhls and S. Katzenbeisser. IoTCat: A Multidimensional Approach to Categorize IoT Devices in order to Identify a Delegate for Cybersecurity Functions. In Proceedings of the Workshop AIoTS at the Applied Cryptography and Network Security (ACNS), Springer, Jul., 2025.  This is a pre-print. pdf... 
  • E. Geloczi, H. C. Pöhls, F. Klement, J. Posegga and S. Katzenbeisser. Unveiling the Shadows: An Approach towards Detection, Precise Localization, and Effective Isolation of Concealed IoT Devices in Unfamiliar Environments. In Proceedings of the 23rd Workshop on Privacy in the Electronic Society (WPES '24), Oct., 2024. doi...  pdf... 
  • R. Brenner, M. Leithäuser, S. Jänich and H. C. Pöhls. Updatefähigkeit als Konstruktionsanforderung. In Recht Digital (RDi): 252 -264, 2024. paper... 
  • H. C. Pöhls, S. Gebauer, F. Scharnböck, K. Spielvogel and J. Posegga. MQfilTTr: Strengthening Smart Home Privacy through MQTT Traffic Manipulation. In Proc. of the 14th International Conference on Information Security Theory and Practice (WISTP 2024), Springer, Feb., 2024.  This is a pre-print. Final paper to appear in Springer LNCS series. doi...  pdf... 
  • N. Rakotondravony, H. C. Pöhls, J. Pfeifer and L. Harrison. Viz4NetSec: Visualizing Dynamic Network Security Configurations of Everyday Interconnected Objects in Home Networks. In Proceedings of the 26th International Conference on Human-Computer Interaction (HCII 2024), Springer, Jul., 2024.  This is a pre-print. Final paper to appear in Springer series "HCII (International Conference on Human-Computer Interaction)" doi...  pdf... 
  • D. Eckhardt, F. Freiling, D. Herrmann, S. Katzenbeisser and H. C. Pöhls. Sicherheit in der Digitalisierung des Alltags: Definition eines ethnografisch-informatischen Forschungsfeldes für die Lösung alltäglicher Sicherheitsprobleme. In Konferenzband der 12. Jahrestagung des Fachbereichs Sicherheit der Gesellschaft für Informatik e.V. (GI Sicherheit 2024), pages 107-118, Gesellschaft für Informatik, Bonn, Apr., 2024.  Open Access: doi...  paper... 
  • T. Lorünser, R. Misoczki, S. Kölbl, S. Krenn, H. C. Pöhls, J. Traoré and R. Kikuchi. Recent Development of SC 27 / WG2 Cryptographic Standards. In ISO SC 27 Journal Volume 4, Issue 2, June 2024, pages 14-22, ISO/IEC, 2024. doi...  pdf... 
  • D. Eckhardt, F. Freiling, D. Herrmann, S. Katzenbeisser and H. C. Pöhls. Sicherheit in der Digitalisierung des Alltags: Definition eines ethnografisch-informatischen Forschungsfeldes für die Lösung alltäglicher Sicherheitsprobleme. Technical Report of Fakultät für Informatik und Mathematik, Universität Passau, Nov., 2023. doi...  pdf... 
  • H. C. Pöhls. Video: Komplexität --- Kurzfilm im Rahmen des ForDaySec Projektes. Talk at the LinkedIn post of Fordaysec research project, Passau, Germany, 2023. video...  doi... 
  • G. Runze, M. Haimerl, M. Hauer, T. Holoyad, O. Obert, H. C. Pöhls, R. Tagiew and J. Ziehn. Ein Werkzeug für eine gemeinsame KI-Terminologie. In JavaSPEKTRUM 03/2023, SIGS DATACOM GmbH, May, 2023. paper... 
  • M. Shirali, T. Tefke, R. C. Staudemeyer and H. C. Pöhls. A Survey on Anonymous Communication Systems with a Focus on Dining Cryptographers Networks. In IEEE Access, 11: 18631-18659, 2023.  This is an arXiv preprint arXiv:2212.08275. Original is open access and available on IEEE Explore. doi...  pdf... 
  • H. C. Pöhls. Towards a unified abstract architecture to coherently and generically describe security goals and risks of AI systems. In Proc. of 19th International Workshop on Security and Trust Management (STM2023), pages 85-94, Springer, Sept., 2023.  This is a pre-print. doi...  pdf... 
  • S. Krenn, H. C. Pöhls and J. Traoré. Achieving privacy and authenticity through advanced digital signature mechanisms. In ISO SC 27 Journal Vol. 1 (3), pages 20-27, ISO/IEC, 2022. doi...  pdf... 
  • R. Adler et al. Deutsche Normungsroadmap Künstliche Intelligenz (Ausgabe 2). DIN / DKE, Dec., 2022. pdf... 
  • R. Adler et al. German Standardization Roadmap Artificial Intelligence (2nd Edition) - English. DIN / DKE, Dec., 2022. pdf... 
  • F. Klement, H. C. Pöhls and S. Katzenbeisser. Change your Car's Filters: Efficient Concurrent and Multi-Stage Firewall for OBD-II Network Traffic. In IEEE International Workshop on Computer-Aided Modeling and Design of Communication Links and Networks (CAMAD), pages 19-25, IEEE, Nov., 2022.  This is a pre-print. Original will be available on IEEE Explore. doi...  pdf... 
  • F. Klement, H. C. Pöhls and S. Katzenbeisser. Man-in-the-OBD: A modular, protocol agnostic firewall for automotive dongles to enhance privacy and security. In 5th International Workshop on Attacks and Defenses for Internet-of-Things (ADIoT 2022) in conjunction with ESORICS, pages 143-164, Springer, Dec., 2022.  This is a pre-print. doi...  pdf... 
  • K. Spielvogel, H. C. Pöhls and J. Posegga. TLS Beyond the Broker: Enforcing Fine-grained Security and Trust in Publish/Subscribe Environments for IoT. In Proc. of 17th International Workshop on Security and Trust Management (STM2021), pages 145-162, Springer, Sept., 2021.  Best Paper Award. Pre-print also available on https://arxiv.org/abs/2109.01169 doi...  pdf... 
  • F. Menges, T. Latzo, M. Vielberth, S. Sobola, H. C. Pöhls, B. Taubmann, J. Köstler, A. Puchta, F. Freiling, H. P. Reiser and G. Pernul. Towards GDPR-compliant data processing in modern SIEM systems. In Computers & Security, 103 (102165), Apr., 2021. doi...  pdf... 
  • N. Petroulakis, K. Fysarakis, H. C. Pöhls, V. Kulkarni, G. Spanoudakis, A. Bröring, M. Papoutsakis, M. Michalodimitrakis and S. Ioannidis. Pattern-driven Security, Privacy, Dependability and Interoperability in IoT. In Security Risk Management for the Internet of Things: Technologies and Techniques for IoT Security, Privacy and Data Protection, pages 121-142, now publishers inc, Jul., 2020. doi...  pdf... 
  • F. Klement, H. C. Pöhls and K. Spielvogel. Towards Privacy-Preserving Local Monitoring and Evaluation of Network Traffic from IoT Devices and Corresponding Mobile Phone Applications. In IEEE 3rd Workshop on Internet of Things Security and Privacy (WISP 2020) held in conjunction with Global IoT Summit 2020 (GIOTS 2020), IEEE, Jun., 2020.  This is a pre-print. Original will be available on IEEE Explore. doi...  pdf... 
  • H. C. Pöhls and N. Rakotondravony. Dynamic Consent: Physical switches and feedback to adjust consent to IoT data collection. In Proceedings of the 2nd International Conference on HCI for Cybersecurity, Privacy and Trust (HCI-CPT 2020) held in conjunsction with the 22nd International Conference on Human Computer Interaction (HCII 2020), pages 322-335, Springer, Jul., 2020.  This is a pre-print. doi...  pdf... 
  • S. Krenn, H. C. Pöhls, K. Samelin and D. Slamanig. Fully Invisible Protean Signatures Schemes. In IET Information Security, 14: 266-285, May, 2020. doi...  pdf... 
  • R. C. Staudemeyer, H. C. Pöhls and M. Wójcik. What it takes to boost Internet of Things privacy beyond encryption with unobservable communication: a survey and lessons learned from the first implementation of DC-net. In Journal of Reliable Intelligent Environments (JRIE), 5 (1): 41-64, Apr., 2019. doi...  pdf... 
  • H. C. Pöhls. Video: Interview zu "Sicherheit in der Cloud durch schwärzbare Signaturen am Beispiel von signierten Medizindaten". Talk at the Interview Universität Passau, Passau, Germany, 2018. video... 
  • H. C. Pöhls. Increasing the Legal Probative Value of Cryptographically Private Malleable Signatures. Ph.D. Thesis, University of Passau, Feb., 2018. pdf... 
  • L. Sell, H. C. Pöhls and T. Lorünser. C3S: Cryptographically Combine Cloud Storage for Cost-Efficient Availability and Confidentiality. In Proceedings of the 10th International Conference on Cloud Computing Technology and Science (CLOUDCOM 2018), IEEE, Dec., 2018.  This is a pre-print. doi...  pdf... 
  • S. Krenn, H. C. Pöhls, K. Samelin and D. Slamanig. Protean Signature Schemes. In Proc. of the 17th conference on Cryptology and Network Security (CANS 2018), pages 256-276, Springer, Sept., 2018.  This is the full version also available on eprint. doi...  pdf... 
  • T. Lorünser, H. C. Pöhls, L. Sell and T. Länger. CryptSDLC: Embedding Cryptographic Engineering into Secure Software Development Lifecycle. In Proceedings of the 13th International Conference on Availability, Reliability and Security (ARES 2018), pages 4:1-4:9, ACM, Aug., 2018. doi...  pdf... 
  • H. C. Pöhls. Kryptographie --- die neue Generation sicherer Cloud-Services?. Talk at the Hosting and Service Provider Summit 2018, Frankfurt, Germany, 2018. pdf... 
  • R. C. Staudemeyer, H. C. Pöhls and M. Wójcik. The road to privacy in IoT: beyond encryption and signatures, towards unobservable communication. In Proc. of The 7th workshop on IoT-SoS: Internet of Things Smart Objects and Services (WOWMOM SOS-IOT 2018), IEEE, July, 2018.  This is a pre-print. doi...  pdf... 

Selected Project Work


FORDAYSEC Logo

FORDAYSECCo principal investigator;
interdisciplinary research for improving IT security focussing on development of technologies and solutions suitable for everyday digital life use; Controlling a budget of ∼0.8 Mio.€; Co-PI for „Architectures and services for secure everyday digitization“ involving researchers from 5 universities; member of the project's steering board and the project's communication strategy committee.

[ 4 years – 8 partners – funding: ∼3.3 Mio.€ by Bavarian State Ministry for Science and the Arts ]


SEMIOTICS Logo

SEMIOTICSActing principal investigator;
research on the development of a pattern-driven framework built upon existing IoT platforms to enable and guarantee secure and dependable actuation and semi-autonomic behaviour in industrial IoT applications; Controlling a budget of ∼0.7 Mio.€; Lead of task on „End-To-End Security and Privacy“ involving industrial and academic partners.

[ 3 years – 9 partners – funding: ∼5 Mio.€ in EU H2020 Research and Innovation – size: 610 person months ]


STANDICT Logo

STANDICTseveral Grants;
I received three grants which allowed me to standardise so called redactable signature schemes: a special but well researched type of cryptographic signature schemes that fulfils Integrity and Authenticity guarantees following EU eIDAS signature regulation and at the same time allow to remove signed data such that it complies with data protection regulation EU GDPR. The grants allowed me to stay actively involved as editor for ISO 23264-1 and ISO 23264-2 as well as being active within the German national body as member of the ISO SC27 delegation as an appointed expert.

[ overall: 2 years – overall funding: ∼16.000 € ]


FORSEC Logo

FORSECResearcher;
transferring the three, up until now always separately considered parts of the IT-security process with its three phases (preventive measures against future attacks, defence against ongoing attacks, forensics) into an integrated, interdisciplinary concept - an integrated security process for highly connected IT-systems; devising the research plan for and working in the project's part on „IoT Security (TP 2)“.

[ 4 years – 5 partners – funding: ∼3.4 Mio.€ from Bayerisches Staatsministerium für Bildung und Kultus, Wissenschaft und Kunst – size: ∼670 person months ]


PRISMACLOUD Logo

PRISMACLOUDActing principal investigator;
research on practical cryptographic mechanisms for secure and privacy protecting cloud services based; Controlling a budget of ∼0.7 Mio.€; Lead of work package „Composition of next-generation secure cloud services“ with 103 person months involving industrial and academic partners.

[ 3.5 years – 16 partners – funding: ∼8 Mio.€ in EU H2020 Research and Innovation – size: 919 person months ]


RERUM Logo

RERUMActing scientific\technical co-coordinator; acting principal investigator;
research on security and privacy in the Internet-of-Things (IoT); Controlling a budget of ∼0.7 Mio.€; Lead of work package „Security“ with 118 person months involving industrial and academic partners.

[ 3 years – 12 partners – funding: ∼5.2 Mio.€ in EU FP7 STREP - size: 554 person months ]

Selected Standards & Community


Henrich C. Pöhls is expert to the German Standardisation body (DIN) since 2016. He is actively participating as part of several committees as national delegate and as editor or project lead, respectively co-editor, in several national, international and European standardisation activities. Among others he is (or has been) active in the following groups and activities:
  • ISO-SC27-WG2,
  • ISO-SC27-WG4,
  • ISO-SC38,
  • ISO-SC42,
  • CEN-JTC21-WG1-TG-Cybersecurity (co-authored the gap analysis of existing security standards and AI security standards given to CEN-JTC21-WG1),
  • CEN-JTC21-WG5 Cybersecurity,
  • German Standardization Roadmap on Artificial Intelligence -- 2nd edition from 2022 (co-author).

ISO/IEC 23264-1

ISO/IEC 23264-1IT Security Techniques -- Redaction of Authentic Data -- Part:1 General
[ co-editor; 11 pages; ed.1 published in 2021 ]
This document specifies properties of cryptographic mechanisms to redact authentic data. In particular, it defines the processes involved in those mechanisms, the participating parties, and the cryptographic properties.

Digital attestation schemes, in particular digital signature schemes or message authentication codes, can be used to provide data integrity and data origin authentication. A redactable attestation scheme enables the attestation of a message in such a way that, if certain parts of the attested message (known as fields) are redacted (erased, blanked out or permanently removed), the attestation of the redacted message can still be verified. More precisely, upon attesting a message, the attestor knowing the private attestation key can define which parts of the message can later be redacted (in the sense of ISO/IEC 27038) by any entity only knowing the message, the attestation, and the attestor’s redaction key. Any other modification of the attested message (e.g. redaction of other message parts or insertion/modification of any parts) invalidates the attestation.

Redactable attestation schemes are a basic building block in many privacy-preserving applications, such as privacy-preserving data sharing or authentication, where an entity can decide to only reveal the information that is absolutely necessary to forward to a receiver, while the latter is still assured that the received information was previously attested, e.g. by a public authority.

The goal of the ISO/IEC 23264 series is to remedy existing incompatibilities or inconsistently defined properties in existing specifications of such schemes, and to ease the real-world adoption of this technology. Specifically, the goal of this document is to lay the foundations for subsequent parts (e.g. focusing on concrete algorithms for the authenticity-preserving redaction of specific document formats like text, pictures, video, etc.) by specifying and defining common terminology and properties for such schemes.

The ISO/IEC 23264 series complements ISO/IEC 27038, which specifies the redaction of digital documents without addressing the authenticity of the data.


ISO/IEC 23264-2

ISO/IEC 23264-2IT Security Techniques -- Redaction of Authentic Data -- Part:2 Redactable signature schemes based on asymmetric mechanisms
[ editor; approx. 62 pages; to be published in 2024 ]
This document specifies cryptographic mechanisms to redact authentic data. The mechanisms described in this document offer different combinations of the security properties defined and described in ISO/IEC 23264-1. For all mechanisms, this document describes the processes for key generation, generating the redactable attestation, carrying out redactions and verifying redactable attestations.

This document contains mechanisms that are based on asymmetric cryptography using three related transformations:

  • a public transformation defined by a verification key (verification process for verifying a redactable attestation),
  • a private transformation defined by a private attestation key (redactable attestation process for generating a redactable attestation),
  • and a third transformation defined by the redaction key (redaction process) allowing to redact authentic information within the constraints set forth during generation of the attestation such that redacted information cannot be reconstructed.

This document contains mechanisms which, after a successful redaction, allow the attestation to remain verifiable using the verification transformation and attest that non-redacted fields of the attested message are unmodified. This document further details that the three transformations have the property whereby it is computationally infeasible to derive the private attestation transformation, given the redaction and or the verification transformation and key(s).

This document contains the following algorithms based on asymmetric cryptography:
- Generic construction from signature schemes and hash-functions
- Scheme SBZ02-MERSAProd
- Scheme BBDFFKMOPPS10
- Scheme DPSS15
- Scheme MHI06
- Scheme MIMSYTI05.

The scheme DPSS15 is from our 2015 publication at ICICS:
D. Derler, H. C. Pöhls, K. Samelin and D. Slamanig. A General Framework for Redactable Signatures and New Constructions. In ICISC 2015, pages 3-19, Springer, Nov., 2015.   pdf... 


CEN-CENELEC JTC21

CEN-CENELEC / JTC 21 Artificial Intelligence -- Joint standardization on Cybersecurity for AI systems
[ editor of PWI JT021030 in WG5 ]
CEN and CENELEC have established the new Joint Technical Committee 21 ‘Artificial Intelligence’ partially based on the recommendations presented the German Standardization Roadmap for Artificial Intelligence and to address the standardisation request from the EU in order to support the European AI Act (Link to PDF with latest text that has not yet undergone legal-linguistic finalisation). Henrich Pöhls is editor of the Preliminary Work Item (PWI) ``Contributions towards ISO/IEC 27090`` (WI=JT021030) and an expert within WG5 of CEN-CENELEC tasked with standardization on Cybersecurity for AI systems.


IFIP WG 11.6

IFIP WG 11.6 Security and Privacy Protection in Information Processing Systems -- Identity Management
[ secretary ]
IFIP is the International Federation for Information Processing; the TC11 is the Technical Committee on Security and Privacy Protection in Information Processing Systems and WG11.6 is focusing on all aspects of identity management. Henrich C. Pöhls is currently secretary of the IFIP WG 11.6 on Identity Management.
 

NRMKI

NRM KI 2. AusgabeGerman Standardisation Roadmap on Artificial Intelligence (2nd ed.)
[ co-editor; approx. 428 pages; published in Dec. 2022 ]
The objective of the German Artificial Intelligence (AI) Standardization Roadmap is to provide recommendations for action for standardization regarding all AI topics because, in Germany and Europe, it is considered one of the key technologies for future competitiveness in every sector. The EU assumes that the economy in the coming years will grow significantly with the help of AI. This makes the recommendations in the standardization roadmap even more important as they are supposed to strengthen the German economy and science in international AI competition, create innovation-friendly conditions and build trust in the technologies. Henrich C. Pöhls took part in the glossary of terminology and also was co-lead in editing of Section 4.2.2 of the NRM KI on "Security".


AI glossary

AI Glossary Henrich C. Pöhls took part in the editing of the glossary of AI terminology in the 2nd edition of the German Standardisation Roadmap on Artificial Intelligence. He continues this work by serving on the editorial team of AI-Glossary.org. This is an online glossary collecting and sorting AI-related definitions from the most important standardization documents.

 
GI FG KRYPTO

GI FG KRYPTO Fachgruppe Angewandte Kryptologie (KRYPTO) -- Gesellschaft für Informatik (GI)
[ Leitungsgremium ]
Henrich C. Pöhls is part of the steering committee of the work group "KRYPTO" in the German Computer Society (Gesellschaft für Informatik - GI).

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