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dguido's profile
Dan Guido
Dan Guido
Dan Guido
@dguido

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Dan Guido

@dguido

CEO @trailofbits, organizer @EmpireHacking, director @hack_secure. Open DMs.

Brooklyn, NY
trailofbits.com
Joined April 2008

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    1. Dan Guido‏ @dguido 14 May 2016

      Is the prevailing opinion of cryptographers that "cryptographic agility" is a folly of developers?https://simplysecure.org/blog/developers-people-too …

      1 reply 1 retweet 5 likes
      Dan Guido‏ @dguido 14 May 2016

      Cryptographic Agility appears to increase complexity, complicate analysis, and involve users where a single cipher suite would do.

      11:33 AM - 14 May 2016
      • 2 Retweets
      • 3 Likes
      • Ryan Lackey Matthew Tamayo Lettere dal Cyberspazio
      6 replies 2 retweets 3 likes
        1. New conversation
        2. Dan Guido‏ @dguido 24 May 2016
          Replying to @dguido

          Great writeup from @agl__ on the hidden costs and pitfalls of cryptographic agility https://www.imperialviolet.org/2016/05/16/agility.html …

          1 reply 9 retweets 14 likes
        3. 1 more reply
        1. New conversation
        2. Sam Quigley‏ @emerose 14 May 2016
          Replying to @dguido

          depends entirely on the time horizon you're building for

          2 replies 0 retweets 0 likes
        3. Dan Guido‏ @dguido 14 May 2016
          Replying to @emerose

          @bradarkin I saw some backlash about agility from djb. Preference was to deprecate the protocol over swap ciphers.

          2 replies 0 retweets 0 likes
        4. Dan Guido‏ @dguido 14 May 2016
          Replying to @dguido @emerose @bradarkin

          you can see that general preference in most of his code, eg NaCl. I guess you can call me an "agility skeptic."

          1 reply 0 retweets 0 likes
        5. Dan Guido‏ @dguido 14 May 2016
          Replying to @dguido @emerose @bradarkin

          I guess DNSCurve would have been a better example.

          1 reply 0 retweets 0 likes
        6. Dan Guido‏ @dguido 14 May 2016
          Replying to @dguido @emerose @bradarkin

          Anyway, only point was maybe not rushing to agility in all situations since it doesn't come "free" in reality.

          0 replies 0 retweets 0 likes
        7. End of conversation
        1. Brad Arkin‏ @bradarkin 14 May 2016
          Replying to @dguido

          but totally agree that smart defaults for dev consumers of APIs and avoiding presenting end users with any choice at all makes sense

          0 replies 0 retweets 2 likes
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        1. Brad Arkin‏ @bradarkin 14 May 2016
          Replying to @dguido

          designing & impl code now with the understanding that today's smart algo choice will not forever be the right choice seems smart

          0 replies 0 retweets 2 likes
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        1. Sergey Simakov‏ @sergesim 14 May 2016
          Replying to @dguido

          good luck with removing SHA1 otherwise

          0 replies 0 retweets 0 likes
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        1. New conversation
        2. Brad Arkin‏ @bradarkin 14 May 2016
          Replying to @dguido

          I first heard the phrase "crypto agility" in context of MSFT SDL. Goal was to avoid hard coding MD5 with no recourse to swap later

          1 reply 0 retweets 0 likes
        3. Sergey Simakov‏ @sergesim 14 May 2016
          Replying to @bradarkin @dguido

          the real reasons are 1) be ready for advances in crypto (e.g. sunset sha1) 2) address local regulations (China, Russia)

          0 replies 0 retweets 0 likes
        4. End of conversation

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