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Annotation of researchv10no/cmd/descrypt/newcrypt.1, revision 1.1.1.1

1.1       root        1: .TH ENCRYPT 1 
                      2: .SH NAME
                      3: encrypt, decrypt \- encrypt or decrypt a message or file
                      4: .SH SYNOPSIS
                      5: .B encrypt
                      6: [
                      7: .B \-p
                      8: ]
                      9: [ password ]
                     10: .br
                     11: .B decrypt
                     12: [
                     13: .B \-p
                     14: ]
                     15: [ password ]
                     16: .SH DESCRIPTION
                     17: .I Encrypt
                     18: (
                     19: .I decrypt
                     20: )
                     21: reads from the standard input and writes
                     22: on the standard output.
                     23: The
                     24: .I password
                     25: is a key, up to 127 characters in length, which selects a particular transformation.
                     26: If no
                     27: .I password 
                     28: is given,
                     29: .I encrypt
                     30: demands a key from the terminal (without echoing what the user types).
                     31: If the wrong key is given to decrypt, it will usually exit without
                     32: writing on standard output.
                     33: .PP
                     34: If the
                     35: .B \-p
                     36: option is specified, the ciphertext will be encoded into printing
                     37: characters only; suitable for sending through mail.
                     38: In this mode,
                     39: .B decrypt
                     40: ignores any lines that do not have a special prefix (added by
                     41: .B encrypt
                     42: ),
                     43: so messages received in the mail can be read without having to edit
                     44: out headers.
                     45: .PP
                     46: Encryption takes place in three layers.  The first addresses traffic
                     47: analysis threats by hiding the size of the message and insuring that
                     48: if the same message is send repeatedly with the same
                     49: .I password
                     50: the ciphertext will be entirely different each time.
                     51: The second layer is the proposed Data Encryption Standard (DES) used
                     52: in Cipher Block Chaining (CBC) mode.  Finally, a key-dependent character
                     53: transposition is applied to the ciphertext which impedes the
                     54: assembly of corresponding pairs of DES blocks under a known-plaintext attack.
                     55: .PP
                     56: The user is encouraged to use a lengthy password.  A short sequence of
                     57: words chosen at random from a dictionary and committed to memory is
                     58: a good plan.
                     59: .SH FILES
                     60: /dev/tty for typed key
                     61: .SH AUTHOR
                     62: D.P.Mitchell
                     63: .SH BUGS
                     64: This encryption program is not provably secure, and the author gives no
                     65: guarantee that it cannot be broken.

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