polyalphabetic substitution

[ pol-ee-al-fuh-bet-ik suhb-sti-too-shuhn, ‐tyoo-shuhn, pol-ee- ]

/ ˈpɒl iˌæl fəˈbɛt ɪk ˌsʌb stɪˈtu ʃən, ‐ˈtyu ʃən, ˌpɒl i- /

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noun Cryptography.

a system of substitution that mixes together a number of cipher alphabets in a cryptogram so that each plaintext letter is represented by a cipher that repeatedly changes.

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Compare monoalphabetic substitution.

Origin of polyalphabetic substitution

1935–40; poly- + alphabetic

Words nearby polyalphabetic substitution

polyadenitis, polyadenopathy, polyadenylic acid, polyadic, polyalcohol, polyalphabetic substitution, polyamide, polyamine, polyamorous, polyamory, polyandric

How to use polyalphabetic substitution in a sentence

Some of these cutbacks can be achieved through more substitution and incremental steps.
How to Watch Out for Hidden Sugar and Replace With Leaner Substitutes|Diana Le Dean|February 23, 2013|DAILY BEAST
No prize transfer, assignment, or substitution by Winner is permitted.
The Orbitz Business Travel Survey Sweepstakes||December 14, 2012|DAILY BEAST
The substitution of an effect for a cause is an old technique and trick of classical sophistry.
Demonization Is No Excuse|Hussein Ibish|November 20, 2012|DAILY BEAST
The Prize is nontransferable and no substitution of the Prize by the Grand Prize Winner is allowed.
OFFICIAL RULES OF THE IMAX® Award Contest—Deadline Extended||October 8, 2012|DAILY BEAST

Yet here is the great problem with Murray's substitution of imagery for numbers in his social thought.
What the Founders Would Tell Charles Murray|David Frum|February 7, 2012|DAILY BEAST
But as both conceptions are related somehow to the idea of cost, the substitution is never discovered.
The Unsolved Riddle of Social Justice|Stephen Leacock
This one detail—the substitution of springs for weights—has had a far-reaching effect upon organ music.
The Recent Revolution in Organ Building|George Laing Miller
Koch notes that the reading depriued arose from its substitution for the less familiar form priued.
Chaucer's Works, Volume 1 (of 7) -- Romaunt of the Rose; Minor Poems|Geoffrey Chaucer
A second element of the "accent du Midi" just referred to is the substitution of an open for a close o.
Frdric Mistral|Charles Alfred Downer
The work is much quickened by the substitution of steam power, water power, or even horse power for manual labor.
The Wonder Book of Knowledge|Various