Cryptography Basics

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a secret or disguised way of writing; a code.

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cipher

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the number of characters to shift the cipher alphabet

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key

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to decode or decipher.

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decrypt

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convert (information or data) into a cipher or code, especially to prevent unauthorized access.

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encrypt

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convert (a text written in code, or a coded signal) into normal , plaintext language.

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decipher

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A type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.

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Caesar Cipher

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In cryptanalysis, the study of the frequency of letters or groups of letters in a ciphertext is based on the fact that, in any given stretch of written language, certain letters and combinations of letters occur with varying frequencies. What is this study called?

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frequency analysis

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To encrypt a message you need 2 main parts, a _________ & a key

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cipher

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In cryptography, an attacker submitting many passwords or passphrases with the hope of eventually guessing a combination

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brute force

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A method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.

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Vignere