TY  - BOOK
AU  - Friedman, William F
TI  - The Index of Coincidence and its Applications in Cryptanalysis 
SN  - 0894121375
U1  - 005.54 FRI 
PY  - 1987///
CY  - California
PB  - Aegean Park Press
KW  - NSA, Cryptography, National Security Agency
ER  -