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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Matthew Green‏ @matthew_d_green 17 May 2018
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      I wrote a long post about the Efail disclosure to stop myself from tweeting about it anymore. Also it says mean things about PGP which I will regret for months.https://blog.cryptographyengineering.com/2018/05/17/was-the-efail-disclosure-horribly-screwed-up/ …

      11 replies 141 retweets 279 likes
    2. Hector Martin‏ @marcan42 17 May 2018
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      Replying to @matthew_d_green

      FWIW, as much as I still think the disclosure was a huge snafu, I do agree that PGP is probably due for replacement (and PGP *mail* in particular is a big mess). Just without the omg panic style.

      3 replies 0 retweets 9 likes
    3. Lorenzo Franceschi-Bicchierai (he/him)‏Verified account @lorenzofb 17 May 2018
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      Replying to @marcan42 @matthew_d_green

      "PGP is probably due for replacement" is, at this point, an evergreen infosec tweet

      1 reply 2 retweets 13 likes
    4. Hector Martin‏ @marcan42 17 May 2018
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      Replying to @lorenzofb @matthew_d_green

      Just remember that for all its flaws, one of the Efail approaches doesn't even rely on a core PGP problem at all, and the other one only works on ancient emails for clients that correctly check error codes. PGP has problems, but isn't the biggest contributor here.

      2 replies 0 retweets 1 like
    5. Jeffrey Goldberg‏ @jpgoldberg 17 May 2018
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      Replying to @marcan42 @lorenzofb @matthew_d_green

      Whichever is the “bigger” problem, it remains a huge one that PGP uses a mode that has been known to be insecure for nearly 2 decades. That vulnerability has now been exploited. The fact that PGP advocates don’t acknowledge this does little for their credibility.

      1 reply 0 retweets 0 likes
    6. Jeffrey Goldberg‏ @jpgoldberg 17 May 2018
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      Replying to @jpgoldberg @marcan42 and

      I have some sympathy for slowness in moving to AE. We only did so in 2012. But saying “I can continue to use actively exploited broken crypto, because I can’t see how someone might exploit it in my system” is not good.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 17 May 2018
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      Replying to @jpgoldberg @lorenzofb @matthew_d_green

      But... It isn't. GPG has been using MDCs for a long time, and has been hard failing on decryption if they're missing for years. MIME-only vectors and stupid error checking bugs aside, Efail only works on very old PGP messages, using obsolete crypto before MDCs were mandatory.

      8:11 PM - 17 May 2018
      1 reply 0 retweets 0 likes
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        1. Jeffrey Goldberg‏ @jpgoldberg 17 May 2018
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          Replying to @marcan42 @lorenzofb @matthew_d_green

          Ah. Didn’t realize that. When it MDCs become mandatory?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 17 May 2018
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          Replying to @jpgoldberg @lorenzofb @matthew_d_green

          GPG has been using MDCs since 2002 or so, and the lack of an MDC with Twofish and AES (which should always have one since they were introduced after MDCs) became a hard fail in gpg 2.1.9 (released in 2015). So for gpg since 2015, only messages pre-2002 are malleable.

          1 reply 0 retweets 0 likes
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