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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. Colm MacCárthaigh‏ @colmmacc 3 Apr 2019
      • Report Tweet
      • Report NetzDG Violation

      My colleagues and AWS Cryptography engineers, Shay and Nir, found an interesting gap in some of the TLS1.3 security proofs: https://eprint.iacr.org/2019/347  Thankfully it's very low severity, and impacts only external PSK mode, which is very rarely used. Doesn't impact resumption.

      1 reply 36 retweets 69 likes
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    2. Colm MacCárthaigh‏ @colmmacc 3 Apr 2019
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      • Report NetzDG Violation

      The issue is that PSK mode doesn't authenticate an identity, so messages can be rerouted between recipients that have the same PSK. In a way that's obvious, like sharing certs on servers, but there's a less thought-of case too where a message can be reflected back to the sender.

      1 reply 1 retweet 4 likes
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    3. Colm MacCárthaigh‏ @colmmacc 3 Apr 2019
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      PSK = Pre Shared Key. Which is when you configure TLS clients and servers to trust each other based on a (long) shared password. The issue doesn't come up at all if you use SNI or combine PSK with regular certs.

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      Colm MacCárthaigh‏ @colmmacc 3 Apr 2019
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      • Report NetzDG Violation

      I mentioned resumption. because in TLS1.3 session resumption uses the underlying PSK mode. The issue doesn't come up in that case because the PSKs used for resumption mode are exclusively pair-wise. TLS1.3 is still in the best shape we know of any TLS version.

      6:40 AM - 3 Apr 2019
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      • StoneColdMemery Kieran Tully Garrett Wilkin Tony “0-Chill ” Ropson Albert Lunde Yousef Ourabi
      0 replies 1 retweet 5 likes

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