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1.1 ! root 1: .th CRYPT I 10/23/71 ! 2: .sh NAME ! 3: crypt \*- encode/decode ! 4: .sh SYNOPSIS ! 5: .bd crypt ! 6: [ password ] ! 7: .sh DESCRIPTION ! 8: .it crypt ! 9: is an exact implementation of Boris Hagelin's ! 10: cryptographic machine called the M-209 by the U. S. Army [1]. ! 11: .s3 ! 12: .it crypt ! 13: reads from the standard input file and writes ! 14: on the standard output. ! 15: It is thus suitable for use as a filter. ! 16: For a given password, the encryption ! 17: process is idempotent; ! 18: that is, ! 19: .s3 ! 20: .bd " crypt znorkle <clear >cypher" ! 21: .br ! 22: .bd " crypt znorkle <cypher" ! 23: .s3 ! 24: will print the clear. ! 25: .sh "SEE ALSO" ! 26: [1] U. S. Patent 2,089,603. ! 27: .sh BUGS
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