Cryptography

Introduction Keyword Cipher is another method of encrypting alphabetic text. It is a type of monoalphabetic substitution cipher. Monoalphabetic means an alphabet in plain text is mapped to one alphabet in the ciphertext. For example, if the plain text contains multiple occurrences of ‘A’ then all occurrences of ‘A’ are substituted by the same alphabet …

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Introduction Vigenere Cipher is a method of encrypting alphabetic text. It is a polyalphabetic substitution cipher. Polyalphabetic substitution means that an alphabet in plain text is mapped to multiple substitution alphabets. Vigenere cipher is an evolution of Caesar cipher. In Caesar cipher, we shift the alphabets of the plain text by a fixed number of …

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