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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. Hector Martin‏ @marcan42 26 Jan 2017
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      Join IRC channel about a Japanese rhythm game, wind up talking about the diffie-hellman key exchange on 8-bit microcontrollers.

      2 replies 2 retweets 24 likes
    2. Ridley @ a safe distance‏ @11rcombs 26 Jan 2017
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      Replying to @marcan42

      now I'm curious; under what circumstances does it make sense to do DH on an 8-bit MCU?

      2 replies 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 26 Jan 2017
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      Replying to @11rcombs

      Same circumstances as anywhere else. If you need secure key exchange.

      1 reply 0 retweets 1 like
    4. Ridley @ a safe distance‏ @11rcombs 26 Jan 2017
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      Replying to @marcan42

      I guess a lot of the time I end up asking "why use an 8-bit micro when you could have an M0"

      2 replies 0 retweets 1 like
    5. Hector Martin‏ @marcan42 27 Jan 2017
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      Replying to @11rcombs

      We weren't picking micros, just talking about DH performance ;)

      1 reply 0 retweets 1 like
    6. Hector Martin‏ @marcan42 27 Jan 2017
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      Replying to @marcan42 @11rcombs

      Also, as far as I know, most smart card class secure elements are still 8-bit MCUs.

      2 replies 0 retweets 3 likes
    7. Mc Tedson‏ @Mc_Tedson 27 Jan 2017
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      Replying to @marcan42

      But you don't actually program them in assembly, they run JVMs, right ?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 27 Jan 2017
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      Replying to @Mc_Tedson

      Well they *can* run JavaCard (which is a very, very special and cut-down JVM). They can also run raw code.

      2:05 AM - 27 Jan 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Mc Tedson‏ @Mc_Tedson 28 Jan 2017
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          Replying to @marcan42

          I did mess with some Schlumberger Java card, but there was no way to load raw code, and the crypto in java was terribly slow.

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 28 Jan 2017
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          Replying to @Mc_Tedson

          I mean not all smart cards are JavaCards. Some are programmed in native code.

          0 replies 0 retweets 0 likes
          3. End of conversation

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