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Cryptography

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    $\begingroup$ The current hash rate of Bitcoin network is 2^73 hashes per second, which is approximately 2^89 hashes per day, can it be assumed that such effort for brute forcing an AES key is also possible? $\endgroup$ Commented Sep 12, 2017 at 7:47
  • $\begingroup$ @Resa I think that it can be considered as a possible effort for a brute forcing an AES key. As result the suggested number $90$ is incorrect. But I know that 128 bits length is considered as safe (if we don't take into consideration quantum computers). I.e. the requested number is between 90 and 128 $\endgroup$ Commented Sep 12, 2017 at 7:55
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    $\begingroup$ @Raza: you're off by a thousand; bitcoin is currently 8e18 ~ 2^63 /sec. If an AES-128 trial costs about the same as a bitcoin hash, then the resources used for bitcoin (thus demonstrated to be feasible) would brute-force AES-128 in about 500 billion years on average, except our Earth and Sun won't last nearly that long. $\endgroup$ Commented Sep 13, 2017 at 0:12
  • $\begingroup$ yeah you are right bitcoin hashrate is ~ 2^63/sec. I calculated it wrongly and took Tera as 2^50 instead of 2^40 which led the calculation to a difference of 2^10. $\endgroup$ Commented Sep 13, 2017 at 10:14