LIGN17 - K erckhoffs Principle: The security of a...

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Kerckhoff’s Principle: - The security of a cryptosystem must not depend on keeping secret the cryto-algorithm. The security depends only on keeping secret the key. Monoalphabetic SCs: General name given to any substitution cipher in which the cipher alphabet consists of letters or symbols, or a mix of both. - Caesar shift: Any form of cryptographic substitution in which each letter is replaced by another letter of symbol (i.e. shift of 3 space; A =D) - Monoalphabetic SC w/ Keyword: MUSHROOM MUSHROPQTVWXYZABCDEFGIJKLN Codes/Nomenclators: - Codes: Broad meaning; often used to descrive any method for communicating in secr defined as substitution at the levl of words or phrases - Nomenclator: System of encryption that relies on a cipher alphabet, which is used to encrpy the majority of a message, and a limited list of codewords not much more secure that a straightforward copher, because the bulk of a message can be deciphe using frequency analysis and the remaining can be guessed from the context
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This note was uploaded on 03/15/2011 for the course LIGN 17 taught by Professor Kehler during the Spring '08 term at UCSD.

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LIGN17 - K erckhoffs Principle: The security of a...

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