000 00000nam a2200000 a 4500
005 20251203091255.0
020 _a0198532873
082 _a005.82
_bWEL
100 _aWelsh, Dominic
245 _aCodes and Cryptography
260 _aOxford
_bClarendon Press
_c1988
300 _aix,257p.
_c22 cm. PB.
690 _aCryptography
690 _aCodes
964 _b
_c
_d
_e
_f
_g_
997 _a46682 LIBSC C
999 _c36341
_d36341