Related Clues:

• Things broken by Alan Turing
• Systems of signals
• Implements some website design, say
• Mysteries a rainbow's genesis is able to answer?
• Creates a routine, e.g
• Builds a program from scratch, say
• Cryptography creations
• It's not common knowledge
• Esoteric stuff
• In war, can accept things being kept secret
• Cryptographers' studies
• Does a tech job
• Systems for transmitting secret messages
• Secret writings and fragments from Morocco destroyed
• Housing regulations