Crypto: How the Code Rebels Beat the Government Saving Privacy in the Digital Age is a book about cryptography written by Steven Levy, published in 2001. Levy details the emergence of public key cryptography, digital signatures and the struggle between the National Security Agency (NSA) and the "cypherpunks". The book details the creation of Data Encryption Standard (DES), RSA and the Clipper chip. Source: Wikipedia (en)