He explicitly differentiates the Vernam cipher from earlier ciphers: “A running key cipher is a Vernam type system where, in place of a random sequence of letters, the key is a meaningful text.

Los Alamos has been running a demo quantum key distribution system Setup moves the expensive hardware to a single trusted server.

Explaining one of the simplest and historically well-known ciphers, the Caesar cipher, Holden establishes the key mathematical idea behind the cipher and discusses how to introduce flexibility and ...