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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On the farm, the feed for chicks is significantly different from the roosters’; ______ not even comparable.

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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

Example sentences from the Web for polyalphabetic substitution

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

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