4 ms·I don't think there'll be a feasible collision attack on SHA-256 anytime soon.by akx 11y agoI don't think there'll be a feasible collision attack on SHA-256 anytime soon.nbevans 11y agoIt doesn't need to be an attack. Simply a case where two files happen to hash down to the same bytes.akx 11y agoI wouldn't worry... http://stackoverflow.com/a/4014407/51685 http://stackoverflow.com/a/4014407/51685