00277nam a2200109 a 450000500170000002000150001708200160003210000170004824500380006526000380010330000260014120251203110630.0  a0070494835  a005.82bKAH  aKahate, Atul  aCryptography and Network Security  aNew DelhibTata McGraw-Hillc2003  axxii,435p.c24 cm. PB