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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Matthew Green‏ @matthew_d_green 19 May 2015

      New research on Diffie-Hellman in TLS. The 'LogJam' attack, a new active attack on export DHE. http://on.wsj.com/1cNQZVh  http://weakdh.org 

      21 replies 349 retweets 165 likes
    2. Rich Felker‏ @RichFelker 19 May 2015
      Replying to @matthew_d_green

      @matthew_d_green Are sites without export grade DH affected? I would guess not but it's not immediately clear without close reading.

      1 reply 0 retweets 0 likes
    3. Matthew Green‏ @matthew_d_green 19 May 2015
      Replying to @RichFelker

      @RichFelker Only if they use a 512 bit key. Also look at your SMTP/IMAPS server.

      1 reply 0 retweets 0 likes
    4. Rich Felker‏ @RichFelker 19 May 2015
      Replying to @matthew_d_green

      @matthew_d_green From the linked text it sounds like 1024-bit is affected too (passive listening by NSA). Is that incorrect?

      1 reply 0 retweets 0 likes
    5. Matthew Green‏ @matthew_d_green 19 May 2015
      Replying to @RichFelker

      @RichFelker The ability to passively eavesdrop on 1024 is just conjecture. It seems feasible for the NSA and consistent w the Snowden docs.

      1 reply 1 retweet 0 likes
    6. Rich Felker‏ @RichFelker 19 May 2015
      Replying to @matthew_d_green

      @matthew_d_green Modern ssh servers seem to use diffie-hellman-group14-sha1 (support is mandatory per RFC4253) which is 2048-bit.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 19 May 2015

      @matthew_d_green My understanding is that TLS DH does not provide forward secrecy anyway and should not be used at all; is this right?

      8:19 PM - 19 May 2015
      1 reply 0 retweets 0 likes
        1. New conversation
        2. David Adrian‏ @davidcadrian 19 May 2015
          Replying to @RichFelker

          @richfelker @matthew_d_green DHE_* ciphers provide forward secrecy, DH_* do not and require a special type of certificate.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 19 May 2015
          Replying to @davidcadrian

          @davidcadrian @matthew_d_green Thanks. So are the HTTPS sites at risk using <=1024-bit-p DHE?

          1 reply 0 retweets 0 likes
        4. David Adrian‏ @davidcadrian 19 May 2015
          Replying to @RichFelker

          @richfelker @matthew_d_green Correct.

          0 replies 0 retweets 0 likes
        5. End of conversation

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