H. Beker: opere
- 1982 Cipher Systems. The Protection of Communications, Northwoods, London
- con: F. Piper
- 1985 Secure Speech Communications, Academin Press, New York
H. Beker: opere
- 1982 Cipher Systems. The Protection of Communications, Northwoods, London
- con: F. Piper
- 1985 Secure Speech Communications, Academin Press, New York
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