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The light inside is broken, but I still work. The Cadillac of online bookmarking sites. Alleged nocoiner. http://pinboard.in  maciej@ceglowski.com +1 415 610 0231

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    1. Steven M. Bellovin‏Verified account @SteveBellovin 9 Jun 2018
      Replying to @matthew_d_green

      Ah--I thought that URL was taking you to a QR code. But I'd call a QR code a written note for those purposes, at least if it's a longterm key (which is what he's talking about). But that brings up another point: when did session keys come into existence? Enigma approximated them.

      1 reply 0 retweets 1 like
    2. Matthew Green‏Verified account @matthew_d_green 9 Jun 2018
      Replying to @SteveBellovin

      Well the difference is that losing a copy of my Signal QR code doesn’t leak my secret key. Just the fingerprints of my public key. So it’s technically not that far off what the principles were looking for.

      3 replies 0 retweets 4 likes
    3. Matthew Green‏Verified account @matthew_d_green 9 Jun 2018
      Replying to @matthew_d_green @SteveBellovin

      I wonder when session keys were invented. Surely someone in the classical era must have thought of them as a way to foil cryptanalysis!

      2 replies 0 retweets 1 like
    4. Steven M. Bellovin‏Verified account @SteveBellovin 9 Jun 2018
      Replying to @matthew_d_green

      Right--but I can't think of an example before Enigma, and it only changed part of the ground settings to get the actual session key.

      1 reply 0 retweets 0 likes
    5. Matthew Green‏Verified account @matthew_d_green 9 Jun 2018
      Replying to @SteveBellovin

      I think it’s an interesting question. I just can’t believe *someone* never thought of it? Even for Vigenere that would have been a game changer.

      1 reply 0 retweets 2 likes
    6. matt blaze‏Verified account @mattblaze 9 Jun 2018
      Replying to @matthew_d_green @SteveBellovin

      The concept falls most naturally out of an architecture with some kind of automated key distribution scheme, whether that's public key crypto or a Kerberos-like central authority. So it seems natural that it came into use fairly late, after computers.

      2 replies 0 retweets 2 likes
    7. Matthew Green‏Verified account @matthew_d_green 9 Jun 2018
      Replying to @mattblaze @SteveBellovin

      But even without key exchange: the inspiration for per-message session keys was also to thwart cryptanalysis that might be performed due to the repeated use of long-term keys on lots of message material, right?

      2 replies 0 retweets 2 likes
    8. matt blaze‏Verified account @mattblaze 9 Jun 2018
      Replying to @matthew_d_green @SteveBellovin

      Sure, but if you don't have some kind of automated key distribution mechanism, why not just have a bigger list of shorter-lived keys in your codebook? The motivation comes from being able to automate it.

      3 replies 0 retweets 3 likes
    9. Matthew Green‏Verified account @matthew_d_green 9 Jun 2018
      Replying to @mattblaze @SteveBellovin

      Because having a bigger key list would make it impossible to memorize a key?

      2 replies 0 retweets 0 likes
    10. matt blaze‏Verified account @mattblaze 9 Jun 2018
      Replying to @matthew_d_green @SteveBellovin

      I don't think Enigma was intended for memorized keys; certainly the Nazis used codebooks.

      2 replies 0 retweets 2 likes
      Pinboard‏ @Pinboard 9 Jun 2018
      Replying to @mattblaze @matthew_d_green @SteveBellovin

      You know who else used codebooks...? Oh, dammit.

      11:27 AM - 9 Jun 2018
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