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]

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]