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Annotation of researchv10dc/man/adm/man1/crypt.1, revision 1.1

1.1     ! root        1: .TH CRYPT 1
        !             2: .CT 1 misc files secur
        !             3: .SH NAME
        !             4: crypt, encrypt, decrypt \- encode/decode
        !             5: .SH SYNOPSIS
        !             6: .B /usr/games/crypt
        !             7: [
        !             8: .I password
        !             9: ]
        !            10: .PP
        !            11: .B /usr/games/encrypt
        !            12: [
        !            13: .B -p
        !            14: ] [
        !            15: .I password
        !            16: ]
        !            17: .PP
        !            18: .B /usr/games/decrypt
        !            19: [
        !            20: .B -p
        !            21: ] [
        !            22: .I password
        !            23: ]
        !            24: .SH DESCRIPTION
        !            25: These commands read from the standard input and write
        !            26: on the standard output.
        !            27: The
        !            28: .I password
        !            29: is an enciphering key.
        !            30: If no password
        !            31: is given,
        !            32: one is demanded from the terminal;
        !            33: echoing is turned off while it is being typed in.
        !            34: .I Crypt
        !            35: uses a relatively simple, fast method (rotor machine) for both
        !            36: enciphering and deciphering.
        !            37: .I Encrypt
        !            38: and
        !            39: .I decrypt
        !            40: use a more robust, slower method (DES).
        !            41: Files enciphered by
        !            42: .I crypt
        !            43: are not intelligible to
        !            44: .I encrypt/decrypt,
        !            45: and vice versa.
        !            46: .PP
        !            47: It is prudent to supply the key from the terminal,
        !            48: not from the command line, and to pick a reasonably obscure and long key
        !            49: (6 letters for
        !            50: .I crypt
        !            51: and much longer for
        !            52: .IR encrypt ).
        !            53: .PP
        !            54: Under option
        !            55: .B -p
        !            56: .I encrypt
        !            57: enciphers into printing characters, which can be sent by
        !            58: .IR mail (1).
        !            59: .I Decrypt 
        !            60: can distinguish ciphertext from clear:
        !            61: it will work on a full mail message, headers and all.
        !            62: .SH FILES
        !            63: .F /dev/tty
        !            64: for typed key
        !            65: .SH "SEE ALSO"
        !            66: .IR ed (1),
        !            67: .IR makekey (8)
        !            68: .br
        !            69: J. A. Reeds and P. J. Weinberger,
        !            70: `File Security and the Unix Crypt Command,'
        !            71: .I AT&T Bell Laboratories Technical Journal,
        !            72: .B 63
        !            73: (1984) 1673-1684
        !            74: .SH BUGS
        !            75: Encipherment cannot frustrate
        !            76: adversaries with super-user privileges.
        !            77: Cryptogames have other dangers too.
        !            78: The only useful application 
        !            79: is in data transmission.

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