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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 2 Jun 2015

      I'm trying to fight fires as the IETF is writing requisition orders for gasoline and being snarky about it: https://www.ietf.org/mail-archive/web/tls/current/msg16620.html …

      2 replies 3 retweets 5 likes
    2. Ryan Sleevi‏ @sleevi_ 3 Jun 2015
      Replying to @bascule

      @bascule To be fair, it does seem like you're missing a bit about how the spec works :) Subtleties about here

      1 reply 0 retweets 0 likes
    3. Ryan Sleevi‏ @sleevi_ 3 Jun 2015
      Replying to @sleevi_

      @bascule +=Supports,C=Client, S=Server. C(+)&S(-) - S shouldn't configure DHE, period. C(-)&S(+) - S's TLS lib should know to select !DHE

      2 replies 0 retweets 0 likes
    4. Ryan Sleevi‏ @sleevi_ 3 Jun 2015
      Replying to @sleevi_

      @bascule C(+)&S(+) - Use FF-DHE. Or ECDHE if you can. C(-)&S(-) - Neither S nor C should configure DHE, period.

      1 reply 0 retweets 0 likes
    5. Ryan Sleevi‏ @sleevi_ 3 Jun 2015
      Replying to @sleevi_

      @bascule Assumption is that when S(+) see's a CH w/o C(+), it knows to choose !DHE. S(-) or C(-) shouldn't accept/offer DHE if Java involved

      2 replies 0 retweets 0 likes
    6. Ryan Sleevi‏ @sleevi_ 3 Jun 2015
      Replying to @sleevi_

      @bascule No point in making S(-) know about C(+) instead of just making S(+) too. And C(-) can never know about S, thus risk in offering DHE

      1 reply 0 retweets 0 likes
    7. Tony Arcieri‏ @bascule 3 Jun 2015
      Replying to @sleevi_

      @sleevi_ my problem is I have to reach out to CDNs flipping on 4096-bit DHE and breaking legacy Java clients and tell them don't do that...

      1 reply 0 retweets 0 likes
      Tony Arcieri‏ @bascule 3 Jun 2015

      @sleevi_ ...because it's not just breaking my clients. It's breaking everyone who's using JRuby and trying to talk to RubyGems

      1:01 AM - 3 Jun 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Tony Arcieri‏ @bascule 3 Jun 2015
          Replying to @bascule

          @sleevi_ I got @RubyGems to roll back their DH group "hardening" after it broke JRuby, but who does DH group hardening actually help?

          1 reply 0 retweets 0 likes
        3. Tony Arcieri‏ @bascule 3 Jun 2015
          Replying to @bascule

          @sleevi_ people saw Logjam as a problem and want to switch to a more secure configuration, but it catastrophically broke Java clients

          1 reply 0 retweets 0 likes
        4. Tony Arcieri‏ @bascule 3 Jun 2015
          Replying to @bascule

          @sleevi_ if it were a Java 7 or Java 8 client, they should prefer ECDHE over DHE anyway. Hardening the legacy is causing hard failures

          0 replies 0 retweets 0 likes
        5. End of conversation

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