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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. Daniel Spiewak‏ @djspiewak 23 Dec 2014

      A set of ideas pertaining to cryptographic validation of Git release branches and artifacts:https://gist.github.com/djspiewak/a6cef156708c6a95906d …

      1 reply 4 retweets 14 likes
    2. Tony Arcieri‏ @bascule 23 Dec 2014
      Replying to @djspiewak

      @djspiewak SHA1 may be "easy to collide" but really you're talking about a second preimage attack, right? (that said, SHA1 still sucks)

      1 reply 0 retweets 0 likes
    3. Brian McKenna‏ @puffnfresh 25 Dec 2014
      Replying to @bascule

      @bascule @djspiewak "easy to collide" <- as in, should only take like $500k of EC2 to generate a collision. Is there something I'm missing?

      3 replies 0 retweets 0 likes
    4. Daniel Spiewak‏ @djspiewak 25 Dec 2014
      Replying to @puffnfresh

      @puffnfresh @bascule For some projects and some applications, that would be money well spent for an attacker.

      2 replies 0 retweets 0 likes
    5. Brian McKenna‏ @puffnfresh 25 Dec 2014
      Replying to @djspiewak

      @djspiewak @bascule what would a collision do? Only going to break things - not going to be able to inject any specific code.

      2 replies 0 retweets 0 likes
    6. Daniel Spiewak‏ @djspiewak 25 Dec 2014
      Replying to @puffnfresh

      @puffnfresh @bascule Remember that you can always pad out a directory with arbitrary data.

      1 reply 0 retweets 1 like
      Tony Arcieri‏ @bascule 25 Dec 2014
      Replying to @djspiewak

      @djspiewak @puffnfresh that won't help unless you can pull off a second preimage attack, which we don't know how to do today

      2:32 PM - 25 Dec 2014
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Tony Arcieri‏ @bascule 25 Dec 2014
          Replying to @bascule

          @djspiewak @puffnfresh we should definitely move away from SHA1, but the attacks are entirely hypothetical at this point

          3 replies 0 retweets 0 likes
        3. Daniel Spiewak‏ @djspiewak 25 Dec 2014
          Replying to @bascule

          @bascule @puffnfresh Even beyond hypothetical attacks, signing the directory is very nice since it narrows the scope of detection.

          0 replies 0 retweets 0 likes
        4. End of conversation

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