TY  - BOOK
AU  - Smith, Laurence Dwight
TI  - Cryptography, the science of secret writing
SN  - 9780486202471
SN  - 43006666
U1  - 652.8 SMI 
PY  - 1943///]
CY  - New York
PB  - W. W. Norton & Company
KW  - Ciphers
KW  - Cryptography
ER  -