cilly: an indicator chosen non-randomly, for example by using a girlfriend's initials, an obscenity, or the indicator from the previous message.
crib: a piece of plaintext believed to be contained in an encrypted message. For example, a regular introduction or sign-off phrase.
depth: the alignment of two messages encrypted with the same key.
gardening: performing an action in order to provoke a stereotyped message, thereby providing a crib. E.g. laying mines at a certain grid reference, in order to provoke the enemy into reporting that mines were laid at that grid reference.
indicator: the first three or four letters of an Enigma message giving the rotor positions used for that message.
kiss: a message broadcast at a low (and solved) level of encryption later resent at a high level, thereby providing a massive crib.
pinch: the obtaining of enemy cryptographic equipment or code books clandestinely.
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This page updated Mon, September 04, 2006, around about 24:00 ish (BST).