HomePage | RecentChanges | Preferences You can edit this page right now! It's a free, community project Cryptography (from the Greek language kryptós and gráphein, "to write") is the study of the principles and techniques by which information can be concealed in ciphers and later revealed by legitimate users employing the encryption key (see /Key?), but in which it is either impossible or computationally infeasible for an unauthorized person to do so.