| 000 | 00374nam a2200145Ia 4500 | ||
|---|---|---|---|
| 999 |
_c21863 _d21863 |
||
| 008 | 190711s9999 xx 000 0 und d | ||
| 020 | _a0471891924 | ||
| 082 | _a621.3852 B424 | ||
| 100 | _aBeker, Henry. | ||
| 100 | _aPiper, Fred. | ||
| 245 | 0 | _aCipher Systems: The Protection of Communications | |
| 260 |
_aLONDON _bNORTHWOOD _c1982 |
||
| 300 | _a24X16 427 | ||
| 942 | _cBK | ||