1) Cipher 2) Code 3) Cypher 4) Encipher 5) Encode 6) Inscribe 7) Make hard to read 8) Make safe from data thieves 9) Make secret 10) Make unfathomable 11) Put into code 12) To encipher or encode 13) Use an Enigma machine 14) Write 15) Write in code Found on https://www.crosswordclues.com/clue/encrypt