TY  - BOOK
AU  - WilliamStallings
TI  - Cryptography &network security ,principles &practices 4th edition
PY  - 2005///
CY  - [S.l.]
PB  - Prentice Hall,2005: 4th edition
UR  - http://www.amazon.com/exec/obidos/ASIN/B0032V2N72/chopaconline-20
ER  -