00295nam a2200109 a 450000500170000002000150001708200150003210000190004724500630006626000300012930000260015920251203110159.0  a1568810822  a512.7bCOU  aCoutinho, S.C.  aMathematics of ciphersbNumber theory amd RSA Cryptography  aNatickbA.K. Petersc1998  axv, 196p.c23 cm H.B.