00590nam a2200193Ia 450000500170000000800410001702000180005804000180007604100080009408200200010210000210012224500710014325000120021426000470022630000290027365000330030265000390033565000220037420251106154442.0210716s2008    xx            000 0 und d  a9788120333512  cAIMIT LIBRARY  aeng  a005.8 21bPATD  aPatel, Dhiren R.  aInformation security : btheory and practice /cBy Dhiren R Patel.  a1st ed.  aNew Delhi :bPHI Learning Pvt Ltd ,c2008.  axiv,298p. ;bPBc24.3 cm  aClassical encryption methods  aInformation hiding : steganography  aVirus and malware