[bitcoin-dev] Time to worry about 80-bit collision attacks or not?

Peter Todd pete at petertodd.org
Mon Jan 11 06:57:42 UTC 2016


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On 10 January 2016 22:57:15 GMT-05:00, Rusty
>Cheers,
>Rusty.
>[1] Weirdly, the bitcoin network is doing this much work every 57
>    days, for about $92M.  If that's all the attack costs, it's under
>    1M in 10 years.

Don't get too caught up in Moore's law here - more likely the attack will become feasible because SHA2 is partially weakened, as happened with SHA1. Having industry standard safety margins would make such a weakening be an academic problem rather than an emergency.
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