Source : WordNet®

encode
     v : convert ordinary language into code; "We should encode the
         message for security reasons" [syn: {code}, {encipher}, {cipher},
          {cypher}, {encrypt}, {inscribe}, {write in code}] [ant:
         {decode}]

Source : Free On-Line Dictionary of Computing

encode
     
        1.  To convert {data} or some physical
        quantity into a given format.  E.g. {uuencode}.
     
        See also {encoder}.
     
        2.  To encrypt, to perform {encryption}.
     
        (1999-07-06)