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A type of cipher that uses multiple alphabetic strings.

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A type of cipher that uses multiple alphabetic strings.

(a) Substitution based

(b) Transposition-based

(c) Polyalphabetic substitution based

(d) Mono alphabetic substitution based

I got this question by my school teacher while I was bunking the class.

My doubt stems from Cryptography in portion Information Technology of Computer Fundamentals

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Right answer is (c) Polyalphabetic substitution based

The best explanation: These ciphers are similar to that of mono alphabetic ciphers. Multiple strings are used to encode the plain text.

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