Related Clues:

• Make secret
• Make hard to read
• Protect, in a way
• Write, as a secret message
• Make cryptic
• Hide, in a way
• Cipher
• Create a cryptogram
• Make unreadable, for security
• Convert to dots and dashes
• Make hard to figure out
• Do some espionage work
• Create, as a cryptogram
• Write, as cryptograms
• Convert a message