00442nam a22001457a 4500003000400000005001700004008004100021082001600062100002200078245007000100260004600170300002700216655002200243655003100265SNU20141218132411.0141218b        xxu||||| |||| 00| 0 eng d  a001.642 DAV  aDavies, Donald W.  aTutorials b:The Security of data in networks c/Donald W. Davies  a.- USA b: IEEE Computer Society c,@1998  a241p.;15cm.bSoftcover  a Security of data  adata security in computer