Cipher
A cipher was an algorithm for performing encryption or decryption.

In 2268, Lieutenant Commander Spock was expected to report to sickbay but there wasn't time as he had to  the symbols of the Preservers' obelisk which were a highly advanced form of cipher writing. Spock believed the symbols were the key to providing rescue to Captain James T. Kirk and the Amerind inhabitants. ()

See also
 Cipher key

External link
 

Computer programming