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     Since the key is an argument to the  crypt  command,  it  is
     potentially visible to users executing ps(1) or a derivative
...
     destroy  any  record  of the key immediately upon entry.  No
     doubt the choice of keys  and  key  security  are  the  most
     vulnerable aspect of crypt.

     crypt implements a  one-rotor  machine  designed  along  the
     lines  of  the  German Enigma, but with a 256-element rotor.
     Methods of attack on such machines are  widely  known,  thus
     crypt provides minimal security.