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Information Security

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  • Many thanks for taking time to write your answer. The 3 level encryption password (sym) -> public/private (asym) -> data (sym) is clearly solving the problem of sharing data between users not being connected at the same time. Commented Jun 18, 2015 at 6:24
  • Because K is only encrypted with public keys it's trivial for an attacker to regenerate K and replace the original file content. The attacker would never have access to the original content, but being able to change the content in a way that it's still readable is a big flaw. Commented Apr 9, 2018 at 15:57
  • @dhinchliff How is it trivial to regenerate K? Commented Apr 25, 2018 at 19:52
  • @interlude Just pick any K, K = "puppy" if you like. Then encrypt the new data with the new K and encrypt the new K with the receiver's public key. Commented Apr 26, 2018 at 10:37
  • @dhinchliff I don't know the official jargon for this but wouldn't that be a K' or K2 or something? Your comment made me think that it's easy to find K somehow. But still I'm not used to the jargon and English is not my native language Commented Apr 28, 2018 at 16:27