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bascule's profile
Tony Arcieri
Tony Arcieri
Tony Arcieri
@bascule

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Tony Arcieri

@bascule

Co-founder @iqlusioninc, formerly @square @chain. Cryptography dilettante, polyglot programmer, key management wrangler, and infrastructure security specialist

San Francisco, CA
tonyarcieri.com
Joined May 2007

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    1. Tony Arcieri‏ @bascule 30 Dec 2014
      Replying to @DefuseSec

      @DefuseSec if you're talking about KS1(k1) ⊕ KS2(k2) ⊕ pt as a product cipher of two stream ciphers' keystreams, do sidechannels amplify?

      2 replies 0 retweets 1 like
    2. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @bascule

      @bascule Probably not, but that's composing ciphers not implementations. I'm thinking more along the lines of vulns independent of crypto.

      1 reply 0 retweets 0 likes
    3. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @DefuseSec

      @bascule With ciphers it's pretty easy to get strongest-of-N but with whole implementations, it could easily be weakest-of-N.

      1 reply 0 retweets 0 likes
    4. Tony Arcieri‏ @bascule 30 Dec 2014
      Replying to @DefuseSec

      @DefuseSec how can secret dependent timings of one keystream generator implementation break the whole construction if the other one is good?

      1 reply 0 retweets 1 like
    5. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @bascule

      @bascule I don't think they can. (I'm currently researching non-crypto sidechans, so my head is far away from learn-bits-of-key attacks :P).

      2 replies 0 retweets 0 likes
    6. Tony Arcieri‏ @bascule 30 Dec 2014
      Replying to @DefuseSec

      @DefuseSec curious what sidechannels you're thinking of then. I was thinking of cache timing sidechannels

      1 reply 0 retweets 0 likes
    7. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @bascule

      @bascule Was thinking of side channels processing the plaintext (line break algorithms, e.g. in an email client). But then I realized...

      1 reply 0 retweets 0 likes
    8. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @DefuseSec

      @bascule ...you don't need to give the other implementation the plaintext at all. RCE vulns are a way better example of worst-of-N.

      1 reply 0 retweets 0 likes
    9. Tony Arcieri‏ @bascule 30 Dec 2014
      Replying to @DefuseSec

      @DefuseSec lol, RCE in an actual cipher implementation would be a catastrophic result indeed

      1 reply 0 retweets 0 likes
    10. Taylor Hornby‏ @DefuseSec 30 Dec 2014
      Replying to @bascule

      @bascule Yes, but remember we're talking about composing entire implementations, e.g. putting a .gpg file in a TrueCrypt container.

      1 reply 0 retweets 0 likes
      Tony Arcieri‏ @bascule 30 Dec 2014
      Replying to @DefuseSec

      @DefuseSec I was thinking more of Tahoe's "100 year cryptography" product cipher case /cc @zooko

      2:17 PM - 30 Dec 2014
      • 2 Likes
      • zooko Taylor Hornby
      0 replies 0 retweets 2 likes

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