Bitcoin networks surpasses 2^80 hashes per week

https://blockexplorer.com/q/hashestowin log(171833398380382098659*24*60*7)/log(2) Gives context to the obsolescence of 80-bit block ciphers (it only takes ten million dollars of dedicated hardware to crack an 80-bit cipher). And context to the NSA's design of Skipjack. Naturally even a 2^64 collision attack requires implausible amounts of storage, so properly designed hash functions should be secure for the indefinite future.