Giovan Battista Bellaso, a 16th-century cryptologist, designed the Vigenere cipher (falsely attributed to diplomat Blaise de Vigenere), believed to be the first cipher that used an encryption key.

It is a technique for encrypting messages consisting of only text and no special characters or numeric digits. It is derived from a much simpler and one of the oldest known encryption systems ...

Secret code or foreign language? For machines, it might not matter. Without any prior knowledge, artificial intelligence algorithms have cracked two classic forms of encryption: the Caesar cipher ...