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progressive-alphabet cipher

noun
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Definition of progressive-alphabet cipher

: a polyalphabetic substitution in which the choice of alphabets runs through them all in a definite order — compare multiple-alphabet cipher

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“Progressive-alphabet cipher.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/progressive-alphabet%20cipher. Accessed 22 Oct. 2020.

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