TY  - BOOK
AU  - Kahn, David
TI  - Code-breakers : the comprehensive history of secret communication from ancient times to the internet
SN  - 9780684831305
U1  - 652.8 
PY  - 1996///
CY  - New York
PB  - Scribner
KW  - Computer sc. Engg
ER  -