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Annotation of 43BSDReno/domestic/man/crypt.0.1, revision 1.1

1.1     ! root        1: 
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        !             4: CRYPT(1)                     1989                       CRYPT(1)
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        !             6: 
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        !             8: NNAAMMEE
        !             9:      crypt - encode/decode
        !            10: 
        !            11: SSYYNNOOPPSSIISS
        !            12:      ccrryypptt [ password ]
        !            13: 
        !            14: DDEESSCCRRIIPPTTIIOONN
        !            15:      TThhiiss iinntteerrffaaccee iiss oobbssoolleetteedd bbyy ddeess((11))..
        !            16: 
        !            17:      _C_r_y_p_t reads from the standard input and writes on the stan-
        !            18:      dard output.  The _p_a_s_s_w_o_r_d is a key that selects a particu-
        !            19:      lar transformation.  If no _p_a_s_s_w_o_r_d is given, _c_r_y_p_t demands
        !            20:      a key from the terminal and turns off printing while the key
        !            21:      is being typed in.  _C_r_y_p_t encrypts and decrypts with the
        !            22:      same key:
        !            23: 
        !            24:          crypt key <clear >cypher
        !            25:          crypt key <cypher | pr
        !            26: 
        !            27:      will print the clear.
        !            28: 
        !            29:      Files encrypted by _c_r_y_p_t are compatible with those treated
        !            30:      by the editor _e_d in encryption mode.
        !            31: 
        !            32:      The security of encrypted files depends on three factors:
        !            33:      the fundamental method must be hard to solve; direct search
        !            34:      of the key space must be infeasible; `sneak paths' by which
        !            35:      keys or cleartext can become visible must be minimized.
        !            36: 
        !            37:      _C_r_y_p_t implements a one-rotor machine designed along the
        !            38:      lines of the German Enigma, but with a 256-element rotor.
        !            39:      Methods of attack on such machines are known, but not
        !            40:      widely; moreover the amount of work required is likely to be
        !            41:      large.
        !            42: 
        !            43:      The transformation of a key into the internal settings of
        !            44:      the machine is deliberately designed to be expensive, i.e.
        !            45:      to take a substantial fraction of a second to compute.  How-
        !            46:      ever, if keys are restricted to (say) three lower-case
        !            47:      letters, then encrypted files can be read by expending only
        !            48:      a substantial fraction of five minutes of machine time.
        !            49: 
        !            50:      Since the key is an argument to the _c_r_y_p_t command, it is
        !            51:      potentially visible to users executing _p_s(1) or a deriva-
        !            52:      tive.  To minimize this possibility, _c_r_y_p_t takes care to
        !            53:      destroy any record of the key immediately upon entry.  No
        !            54:      doubt the choice of keys and key security are the most
        !            55:      vulnerable aspect of _c_r_y_p_t.
        !            56: 
        !            57: FFIILLEESS
        !            58:      /dev/tty for typed key
        !            59: 
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        !            63: Printed 7/27/90             September                          1
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        !            70: CRYPT(1)                     1989                       CRYPT(1)
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        !            73: 
        !            74: SSEEEE AALLSSOO
        !            75:      ed(1), crypt(3), makekey(8)
        !            76: 
        !            77: BBUUGGSS
        !            78:      There is no warranty of merchantability nor any warranty of
        !            79:      fitness for a particular purpose nor any other warranty,
        !            80:      either express or implied, as to the accuracy of the
        !            81:      enclosed materials or as to their suitability for any par-
        !            82:      ticular purpose.  Accordingly, Bell Telephone Laboratories
        !            83:      assumes no responsibility for their use by the recipient.
        !            84:      Further, Bell Laboratories assumes no obligation to furnish
        !            85:      any assistance of any kind whatsoever, or to furnish any
        !            86:      additional information or documentation.
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        !           129: Printed 7/27/90             September                          2
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