00507nam a2200181 a 450000500170000002000180001708200160003510000220005124500430007326000230011630000250013950000180016469000180018296400160020099700190021699900190023595200710025420251203112029.0  a9780863802706  a005.82bSHE  aShepherd, J Simon  aCryptography : diffusing the confusion  aBaldockbRSPc2001  axiv,152p.c20cm.bHB  ainclude index  aCoding theory  bcdefg_  a178410 LIBSC C  c145143d145143  00104070aPUbPUd2011-04-02g2170.00l0o005.82 SHEp178410yBK