TY  - BOOK
AU  - Singh, Simon
TI  - Code book: the secret history of codes and codebreaking
SN  - 9780007635740 (pbk.)
U1  - 652.8 SIN 
PY  - 2000///
CY  - London
PB  - Fourth Estate
KW  - Cryptography
KW  - Data encryption (Computer science)
N1  - Gratis
Vidur Ramasubramanian (UG22-169)
GBP 7.99
ER  -