LEADER 00000nam 2200241 a 4500 001 1857028899 007 t 008 020103r20001999enk r 000 eng d 020 1857028899 040 CURLBL 050 4 Z 103 S6 100 1 Singh, Simon. 245 14 The code book :|bthe secret history of codes and code- breaking. 260 London :|bFourth Estate,|c2000. 300 402p. 650 0 Cryptography. 650 0 Cryptography|xHistory. 650 0 Ciphers. 650 0 Data encryption (Computer science) 650 0 Confidential communications.
|