00372nam a22001337a 4500020001800000040000900018082001500027100002000042110003300062245006100095250001600156260004500172650002100217  a9788120322134  cNust  a005.8bKAU  aCharlie Kaufman  aRadia Perlman, Mike Speciner  aNetwork SecuritybPrivate Communication in a Public Word  a2nd Edition  aNew Delhi:bPHI Learning Pvt Ltd,c2002.  aNetwork Security