TY  - GEN
AU  - Klima, Richard E
TI  - Cryptology: classical and modern with maplets
T2  - Discrete mathematics and its applications
SN  - 9781439872413
PY  - 2012///
CY  - Boca Raton
PB  - CRC
KW  - Cryptology
KW  - Ciphers
ER  -