00378nam a2200145 a 450000500170000002000150001708200160003210000280004811000150007624500340009126000480012530000240017363000170019763000180021420251203092045.0  a0521555590  a005.82bLUB  aLubbe, Jan C.A. Van Der  aGee, Steve  aBasic methods of cryptography  aCambridgebCambridge University Pressc1998  axiv, 229 p.c23 cm.  aCryptography  aDES algorithm