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Letters as fragments of a grid.
Also known as: Freemason cipher, Masonic cipher, Tic-tac-toe cipher
The substitution cipher replacing each letter with the piece of grid surrounding its position.
Replaces each letter with the fragment of grid that enclosed it.
Contexts: History
Offers essentially no cryptographic security, being a simple substitution with a fixed key, and was used for privacy and identity rather than secrecy — on gravestones and in records meant to be read by those who knew the convention.
Contexts: History
Widely associated with Freemasonry, and older than that association: the grid-fragment device appears in earlier cipher literature.
Contexts: History
Letters written as the corner, side or box of a grid that contained them, with a dot distinguishing the second alphabet placed in the same figure.