ocr: e The entropy, In bits, inAlice's - userr name and password - The number of decryptions.per second a single machine cando d m The number.otmachines Mike can use Sm The cost per machine y The time, in seconds, across which Mike can amortize his costs; Mi ike must be protitable aftery seconds 2(e-1), the number oftrial decryptions Mike must doto break one safe S Etim *d), thetime.In.seconds. ittakes Mike to break one safe, onthe average $s =m*$ Smiy, the total expense per second Mike must exceed $C $s's= 2-e-1'Sm/dy.the costpersafe Mike must exceed.
