keying sequence

keying sequence

noun Cryptography.
a sequence made up of letters or numbers that can encode or decode a polyalphabetic substitution cipher one letter at a time.

Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Keying sequence is always a great word to know.
So is ninnyhammer. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
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