00409nam a2200157Ia 450000100060000000800410000602000180004704000130006508200210007810000200009924500390011926000580015830000110021654600070022765000170023468375150918s9999    xx            000 0 und d  a9780132770477  cPK-LaUMT  aRCC 652.8bWRI-C  aWrixon, Fred B.  aCodes and cipherscWrixon, Fred B.  aNew York,USA:bPrentice-Hall General Reference,c1992  a260 p.  aEN  aCryptography