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Annotation of researchv10dc/man/adm/man1/crypt.1, revision 1.1.1.1

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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