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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 7 Jan 2020
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      So the SHA-1 collision guys say "As a side result, this shows that it now costs less than 100k USD to break cryptography with a security level of 64 bits (i.e. to compute 2^64 operations of symmetric cryptography)." But @tmbinc already cracked 56 bits for $1k 9 years ago.

      7 replies 4 retweets 59 likes
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    2. Hector Martin‏ @marcan42 7 Jan 2020
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      So if you're smart enough to not use The Cloud™ and instead buy surplus hardware, it should be possible to crack 64 bits of symmetric crypto in a few weeks for ~$10k in one-time costs (and just power for any repeat runs).

      1 reply 3 retweets 31 likes
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    3. Attie Grande‏ @attiegrande 7 Jan 2020
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      Replying to @marcan42 @tmbinc

      I've never quite followed things like this... wouldn't the cost ~double for 57 bits, and again for 58 bits, etc...? making +8 bits ~256x more expensive? Obviously not considering advances in compute over the decade... unless you were, in which case my point may be moot.

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 7 Jan 2020
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      Replying to @attiegrande @tmbinc

      That was 56 bits in a week, so spend 32x more money and 8x more time and you can do 64 bits in 8 weeks. The power cost is << the equipment cost at that time scale. Factor in technology advances and it should go down to ~10x cost easily. SHA-1 team spent 8 weeks so...

      2 replies 0 retweets 3 likes
      Hector Martin‏ @marcan42 7 Jan 2020
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      Replying to @marcan42 @attiegrande @tmbinc

      (sorry for the previous deleted tweet, brain fart on a couple bits, I just woke up)

      4:13 PM - 7 Jan 2020
      1 reply 0 retweets 0 likes
        1. Attie Grande‏ @attiegrande 7 Jan 2020
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          Replying to @marcan42 @tmbinc

          😄 np... confused me for a sec when I couldn't reply

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