00350nam a2200133Ia 4500020001500000082001900015100002800034245005800062250002500120260003400145300002700179500000500206700000500211  a3540668713  a518.1bB344.DS  aBauer, Friedrich Ludwig  aDecrypted secrets; methods and maxims of cryptologyb  a2nd rev and extended  aBerlinbSpringer-Verlagc2000  axii, 470p. Bibl. Index  a  a