encrypt

from WordNet (r) 3.0 (2006)

encrypt
    v 1: convert ordinary language into code; "We should encode the
         message for security reasons" [syn: {code}, {encipher},
         {cipher}, {cypher}, {encrypt}, {inscribe}, {write in code}]

from The Collaborative International Dictionary of English v.0.48

encrypt \encrypt\ v. t.
   To convert ordinary language or other data into code; to hide
   the meaning of a message by converting it into a form that
   cannot be interpreted without knowing the secret method for
   interpretation, called the key; to encode.

   Syn: encode, code, encipher, cipher, cypher, inscribe, write
        in code.
        [WordNet 1.5]