COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Monoalphabetic substitution cipher
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Polyalphabetic substitution cipher
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Caesar cipher
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Monastic cipher
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Detailed explanation-1: -A poly-alphabetic cipher is any cipher based on substitution, using several substitution alphabets. In polyalphabetic substitution ciphers, the plaintext letters are enciphered differently based upon their installation in the text.
Detailed explanation-2: -The Caesar cipher is a substitution cipher in which each letter in the plaintext is “shifted” a certain number of places down the alphabet. For example, with a shift of 1, A would be B, B would be replaced by C, etc. The method is named after Julius Caesar, who is said to have used it to communicate with his generals.
Detailed explanation-3: -A polyalphabetic cipher substitution, using multiple substitution alphabets. The Vigenère cipher is probably the best-known example of a polyalphabetic cipher, though it is a simplified special case.
Detailed explanation-4: -Substitution Ciphers. Substitution ciphers encrypt the plaintext by swapping each letter or symbol in the plaintext by a different symbol as directed by the key. Perhaps the simplest substitution cipher is the Caesar cipher, named after the man who used it.