00389nam a2200145 a 450000500170000002000180001708200150003510000210005024500620007125000120013326000340014530000260017970000190020570000190022420251203111404.0  a9788120322134  a005.8bKAU  aKaufman, Charlie  aNetwork securitybprivate communication in a public world  a2nd ed,  aNew DelhibPHI Learningc2009  axxvi,713p.c24cm.bPB  aPerlman, Radia  aSpeciner, Mike