#cryptography

Did you know that you can use the ssh-keygen command to sign and verify signatures on arbitrary data, like files and software releases?

"We have used a Sony Playstation 3 to correctly predict the outcome of the 2008 US presidential elections. In order not to influence the voters we keep our prediction secret, but commit to it by publishing its cryptographic hash on this website."

"Collision resistance means that it is infeasible to find two different inputs M and M' with the same hash H(M)=H(M'). Note that many collisions exist, but it has to be infeasible to actually find even a single collision!"