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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. Diego Elio Pettenò‏ @flameeyes 24 Jan 2020
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      So if I'm right, there's only 8 bytes that are used for encryption key in the Libre 2 protocol. 64-bit is not much for a key. Are they just using DES? I have the cyphertext, and what I _think_ is the correct cleartext. What's my best option to figure this out?

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    2. Diego Elio Pettenò‏ @flameeyes 24 Jan 2020
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      @hanno @FiloSottile @marcan42 @angealbertini I'm willing to learn more about cryptography to figure this out. Any suggestion that is shorter than an university course? :)

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    3. hanno‏ @hanno 24 Jan 2020
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      Replying to @flameeyes @FiloSottile and

      well, if it's DES (and with 64 bit it's probably either that or some self-cooked vigenere cipher or something like that) then it's likely one of the five traditional encryption modes. if you have the key you can try them all.

      2 replies 0 retweets 0 likes
    4. Diego Elio Pettenò‏ @flameeyes 25 Jan 2020
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      Replying to @hanno @FiloSottile and

      So I'm now trying to replay the capture and turns out they do seem to use something more clever than I expected. Even if I send the same 64 bit from a capture, the device sends over a different message, with what looks like two separate 64 bit values that are different.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 25 Jan 2020
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      Replying to @flameeyes @hanno and

      CBC mode, a random IV and one block? That would be pretty common.

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      Hector Martin‏ @marcan42 25 Jan 2020
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      Replying to @marcan42 @flameeyes and

      If you know it's DES and the exact mode and don't have the key, you can crack the key for $30 at http://crack.sh . might get a bit pricy if you're guessing the format/parameters though.

      4:40 AM - 25 Jan 2020
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        1. Diego Elio Pettenò‏ @flameeyes 25 Jan 2020
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          Replying to @marcan42 @hanno and

          Unfortunately I can only _guess_ it's DES. What I have is (at least) 64-bit sent Host→Device and at least 2×64-bit sent Device→Host right now. I was trying to set up a second VM just to see if the parts I see constants are really constant, or generated at install.

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