Related Clues:

• Code
• Write, as cryptograms
• Convert a message
• Put into cipher
• Make unreadable
• Secure, in a way
• Write in Playfair, e.g.
• What cryptographers do
• Make secret, in a way
• Encipher
• Make cryptograms
• Turn 'this' into '_ .... .. ...,' e.g.
• Camouflage a message
• Write cryptograms
• Try to make undecipherable