Ciphers can be categorized into several groups based on the nature of transformations performed, Polyalphabetic Substitution is one of the most crack-proof encryption techniques to date. An example of polyalphabetic substitution occurs when using the Vigenere cipher technique shown in the figure below: 1. Use Vigener Cipher technique to find the Ciphertext for the following:   Plaintext: ALMADINAHINTERNATIONALUNIVERSITY       Key: MEDIU   2. Use Vigener Cipher technique to decrypt the following Ciphertext, i.e find the original message (Plaintext):   Ciphertext: WLXKYWJQZOGAUSS   Key: MEDIU

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A: The above question is solved in step 2 :-

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A: Given, n=p*q=15251 ϕ(n)=(p-1)*(q-1)=15000 ⇒pq-p-q+1=15000 ⇒15251-p-q+1=15000 ⇒p+q=252…

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A: As per our Guidelines we are supposed to answer first question only.Kindly repost another question…

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A: Kindly upvote/like. I have provided the appropriate response farther down. Asymmetric encryption,…

Cryptography

Cryptography is a term used in computer science to describe secure information and communication techniques that transform messages in difficult-to-decipher ways using mathematical concepts and a set of rule-based calculations known as algorithms.