nihilist cipher

Fetched 2026-10-26 (cache).

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Noun

1. {{lb|en|algorithm|cryptography|historical}} A [[symmetric]] [[cipher]] in which a [[Polybius square]] using a mixed alphabet is used to [[convert]] both the [[plain text]] and a [[keyword]] to a series of two-digit numbers, which are then summed in the normal way to get the [[ciphertext]], with the key numbers repeated as required; {{lb|en|by extension}} Any of several improved [[algorithm]]s based on this.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.