Benjamin Franklin once said, "Three may keep a secret if two of them are
dead." There is some truth to that thought, but when there is a need to
transmit secret information from one person to another, communication
will undoubtedly be via a cryptosystem. In this second in the series of
"Espionage Black Books," former government intelligence officer Dr Henry
Prunckun explains what codes and ciphers are, how they are created, and
how they can be broken. These fascinating details lead to a discussion
about so-called unbreakable ciphers, and whether they can survive future
attacks by quantum computers and sophisticated search algorithms.