The Radio Hacker's Codebook is a book for computer enthusiasts written by George Sassoon.

The book explains how to receive international radioteletype signals, convert them with a circuit and then decode them on a microcomputer.

[1] Other radioteletype subject included are the FEC and automatic repeat request used in maritime radiocommunications.

The books claims that the Enigma was kept secret for long periods because understanding it could compromise the American M-209 cipher machine, and that it was still being sold to other countries.

[1] Other encryption topics covered include Data Encryption Standard, Vernam cipher (one-time pad), pseudo random number generators, transposition ciphers, and substitution ciphers The Radio Hacker's Codebook is idiosyncratic revealing a personal quest by Sassoon to decrypt military signals on the radio spectrum.