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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. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 6 Mar 2019
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      Hot take: cryptography engineering wouldn’t be that hard if we all just commented our damn code. A lot of the magic _makes sense_!

      18 replies 47 retweets 309 likes
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    2. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 2 Apr 2019
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      To prove that crypto code can be understandable, I gave my best shot at writing a readable Poly1305 implementation. It tries to explain both what it’s doing and how. (It’s also 75% faster than the current one.)https://blog.filippo.io/a-literate-go-implementation-of-poly1305/ …

      10 replies 208 retweets 567 likes
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    3. Daira Hopwood (abolish ICE)‏ @feministPLT 16 Apr 2019
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      Replying to @FiloSottile

      Some suggestions: * put it on GitHub or similar so it can be reviewed there * RFC 7539 is obsoleted by RFC 8439 (fixes bugs; still has 1 erratum) * would be nice to have a ref to explanation/security analysis of Carter-Wegman * no tests/evidence of checking against test vectors.

      1 reply 0 retweets 1 like
    4. Daira Hopwood (abolish ICE)‏ @feministPLT 16 Apr 2019
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      Replying to @feministPLT @FiloSottile

      Also, no warning that this isn't secure unless you encrypt the tag. (Yeah if someone reads the RFC then they would know that, but considering that most application crypto bugs are due to misuse, seems important to reiterate.)

      1 reply 0 retweets 0 likes
    5. Daira Hopwood (abolish ICE)‏ @feministPLT 16 Apr 2019
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      Replying to @feministPLT @FiloSottile

      Incidentally, the proof in https://eprint.iacr.org/2014/613.pdf  is missing any discussion of injectivity of the plaintext/AD encoding, or why the high-order 1 bit is needed.

      1 reply 0 retweets 0 likes
    6. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 16 Apr 2019
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      Replying to @feministPLT

      The real implementation lives at https://go-review.googlesource.com/c/crypto/+/169037 …, there are tests in the package. I think proofs are too high level to discuss in the implementation itself, they are not required to understand the code. What do you mean encrypt the tag? (Will fix the RFC ref, thanks!)

      1 reply 0 retweets 2 likes
      Colm MacCárthaigh‏ @colmmacc 16 Apr 2019
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      Replying to @FiloSottile @feministPLT

      GHASH and POLYVAL values have to be encrypted with AES to become MAC tags. Neither function on its own is a MAC and the key is reversible. I think naked Polyval1305 is also not a MAC, but it needs the nonce to be encrypted, rather than the output, to make it one.

      1:58 PM - 16 Apr 2019
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        2. Filippo Valsorda  🇮🇹‏Verified account @FiloSottile 16 Apr 2019
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          Replying to @colmmacc @feministPLT

          Naked Poly1305 is a MAC AFAIK, it just has single-use keys and no nonce, which is why the original Poly1305-AES construction uses AES to derive them from (key, nonce).

          1 reply 0 retweets 2 likes
        3. Daira Hopwood (abolish ICE)‏ @feministPLT 16 Apr 2019
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          Replying to @FiloSottile @colmmacc

          I stand corrected, the tag isn't encrypted in RFC 8439. (You can do it that way, but AEAD_ChaCha20_Poly1305 doesn't.) In any case the article doesn't mention single-use keys.

          1 reply 0 retweets 1 like
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