Related Clues:

• Crate eggs, e.g
• Create a cipher
• Place in a crate
• Use an Enigma machine, say
• Make tough to make out
• Awful pity Cern has no one to encode data
• Cipher, as a secret message
• Protect a document, in a way
• Immunise, vaccinate
• Protect from hackers, hopefully
• Protect against wild speculation (odds off)
• Hard-skinned alien creature seen from below
• Make it necessary to decrypt
• Scramble and vault on walls of Eton
• Do some cryptography