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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.
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).
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.
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...
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