00870    a2200181   4500003000500000005001700005020001500022040000900037082001500046100002400061245006200085250001000147260003300157300000900190490000600199505046600205650001700671Nust20230216113840.0  a0894122649  cNust  a005.82,NIC  aNichols, Randall K.  aClassical cryptography course Vol.2 /cRandall K. Nichols  aVol-2  aUSAbAegean Park Pressc1996  a449p  v2  aPolyalphabtic Substitution Systems (Page-1), Polyalphabtic Substitution Systems (Page-35), Aperiodic Systems (Page-69), Introduction to Cryptarithms (Page-99), Statistical Attacks (Page-123), Transportation (Page-152), Headlines Puzzles, Playfair, Four Square, Fractionation and Delastelle Systems (Page-203), Introduction to Cryptarithms (Page-251), Passwords, Privacy, Data Protection (Page-268), Codes and Code Systems (Page-292), Cipher Machines (Page-321).  aCryptography