TY  - BOOK
AU  - Klima, Richard
AU  - Sigmon, Neil
TI  - Cryptology: classical and modern 
SN  - 9781138047624
U1  - 005.824 KLI-R 
PY  - 2019///
CY  - Boca Raton
PB  - CRC Press
KW  - Ciphers
KW  - Cryptography
KW  - Cryptography--Data processing
KW  - Data encryption (Computer science)
ER  -