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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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    Dan Guido‏ @dguido 28 Jun 2016

    Dan Guido Retweeted Trail of Bits

    1 year in and I think we're still the only company that figured out this API.https://twitter.com/trailofbits/status/747759173996154881 …

    Dan Guido added,

    Trail of Bits @trailofbits
    Start using the Secure Enclave Crypto API http://blog.trailofbits.com/2016/06/28/start-using-the-secure-enclave-crypto-api … pic.twitter.com/RmGNYnai4y
    8:02 AM - 28 Jun 2016
    • 2 Retweets
    • 5 Likes
    • Mudge SystemsSecurityLab Thomas Pollet L0NGC47 Chris Green Dudley Dingleberry Year of the New New Jian Yang
    2 replies 2 retweets 5 likes
      1. New conversation
      2. olle@nxs.se‏ @nxsolle 28 Jun 2016
        Replying to @dguido

        @trailofbits where in your ruby code do you validate that the sha1 is actually of the timestamped data? Can't find it.. 😢

        2 replies 0 retweets 0 likes
      3. nicktitle‏ @NickTitle 28 Jun 2016
        Replying to @nxsolle @dguido @trailofbits

        we strip user data before sending to backend - that means we only validate the signature server-side

        1 reply 0 retweets 0 likes
      4. olle@nxs.se‏ @nxsolle 28 Jun 2016
        Replying to @NickTitle @dguido @trailofbits

        protocol message contains both data+timestamp and sha1(data+timestamp), where do you check they match?

        1 reply 0 retweets 0 likes
      5. Trail of Bits‏ @trailofbits 28 Jun 2016
        Replying to @nxsolle

        Good catch, that should happen in the middleware but due to low interest we never kept working on it. Easy to add, will do it soon.

        2 replies 0 retweets 0 likes
      6. olle@nxs.se‏ @nxsolle 28 Jun 2016
        Replying to @trailofbits

        seems awfully redundant to send the data and the precalculated sha when sig verification has to recalculate sha anyway...

        1 reply 0 retweets 0 likes
      7. Ryan Stortz‏ @withzombies 28 Jun 2016
        Replying to @nxsolle @trailofbits

        it's a fair point, but it's also only 40 bytes for every tidas request..which maens 40 bytes every touchid prompt

        1 reply 0 retweets 0 likes
      8. olle@nxs.se‏ @nxsolle 28 Jun 2016
        Replying to @withzombies @trailofbits

        also accident waiting to happen. implementers use one value and validate sig using the other, like in tidas-server

        0 replies 0 retweets 1 like
      9. End of conversation
      1. Fred Painchaud‏ @varmapano 28 Jun 2016
        Replying to @dguido

        "It was difficult to overcome the inertia [...]". It is very often the issue, sadly.

        0 replies 0 retweets 0 likes
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