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3. Data Encryption Standard, FIPS Pub. No. 46, National Bureau of Standards, 15 January 1977.
4. Solomon W. Golomb, Shift Register Sequences, Holden Day, San Francisco, 1967.
5. R. McLeice, A Public-Key Cryptosystem Based On Albebraic Coding Theory, DSN Progress Report 42-44, Jet Propulsion Lab, Calif. Inst. of Tech., Pasadina CA, Jan–Feb 1978.