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What is the alternative name of playfair cipher?

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What is the alternative name of playfair cipher?

(a) Wadsworth’s cipher

(b) Wheatstone playfair cipher

(c) Playfair rectangle

(d) Wheatstone cipher

The question was posed to me in exam.

The origin of the question is Cryptography in division Cryptography of Data Structures & Algorithms II

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The correct answer is (b) Wheatstone playfair cipher

Easy explanation - Playfair cipher is also known by the name of Wheatstone playfair cipher. It is because it was discovered by Charles Wheatstone but was promoted by Lord Playfair.

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