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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017

      dear formal methods folk, is there a convenient tool for modelling agent-knowledge in (cryptographic) protocols that I should know of?pic.twitter.com/yaurruxxgL

      3 replies 2 retweets 8 likes
      Show this thread
    2. friend void‏ @volatile_void 15 Sep 2017
      Replying to @edefic

      proverif (“pro” is for “protocol”, I'm pretty sure, not for “professional”) http://prosecco.gforge.inria.fr/personal/bblanche/proverif/ …

      1 reply 0 retweets 1 like
    3. friend void‏ @volatile_void 15 Sep 2017
      Replying to @volatile_void @edefic

      ProVerif works symbolically. It cannot tell you that a key size is too small. For that you'd want CryptoVerif, which is also harder to use.

      1 reply 0 retweets 0 likes
    4. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017
      Replying to @volatile_void

      I'm working with well-defined primitives in fairly boring ways and without truncating anything, so I don't think I'll need that

      1 reply 0 retweets 0 likes
    5. friend void‏ @volatile_void 15 Sep 2017
      Replying to @edefic

      The one weird rule that ProVerif mandates is “never encode a key with itself”.

      1 reply 1 retweet 1 like
    6. friend void‏ @volatile_void 15 Sep 2017
      Replying to @volatile_void @edefic

      I can't find it quickly in the manual, but in the lecture, B. Blanchet insisted strongly that the soundness proofs didn't apply if you did.

      1 reply 0 retweets 1 like
    7. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017
      Replying to @volatile_void

      > Ciphers that securely encrypt their own keys are a field of active research, I'm entirely unsurprised doing it would nuke your proof

      2 replies 0 retweets 4 likes
      Rich Felker‏ @RichFelker 15 Sep 2017
      Replying to @edefic

      I'm rather intrigued by how you would express "does not encrypt its own key" as part of the conditions for a theorem.

      8:02 AM - 15 Sep 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. friend void‏ @volatile_void 15 Sep 2017
          Replying to @RichFelker @edefic

          I'm not a specialist, but in the case of ProVerif it may be something like “let terms be members of the free algebra something something”

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 15 Sep 2017
          Replying to @volatile_void @edefic

          I don't see how that would avoid proving the result applied when you fill in the free terms with a value equal to the key.

          1 reply 0 retweets 0 likes
        4. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017
          Replying to @RichFelker

          reduction rules like this would work afaict reduc forall pfx: bitstring, k: enc_key, sfx: bitstring; recover_key(enc((pfx, k, sfx), k) = k.

          1 reply 0 retweets 0 likes
        5. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017
          Replying to @edefic @RichFelker

          you can freely produce things encrypted with public knowledge etc, the ciphertext constructor doesn't need any restrictions whatsoever

          1 reply 0 retweets 0 likes
        6. *mut "invisible chaotic self-modifying biomachine"‏ @edefic 15 Sep 2017
          Replying to @edefic @RichFelker

          the primary destructor is "you have the key, and the ciphertext, so you can decrypt it" but you can just as easily add the one I just posted

          0 replies 0 retweets 0 likes
        7. End of conversation

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