00287nam a2200109 a 450000500170000002000150001708200160003210000250004824500380007326000400011130000260015120251203110919.0  a0070660468  a005.82bFOR  aForouzan, Behrouz A.  aCryptography and network security  aNew DelhibTata McGraw - Hillc2008  axxvi, 721p.c24cm. PB