UNIT 4 ABCs of Cryptography

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What is plaintext in cryptography?

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Plaintext is the original, unencrypted message that is input into a cryptographic algorithm.

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What is ciphertext?

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Ciphertext is the encrypted output of a cryptographic algorithm, which is not readable without decryption.

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What is a key in cryptography?

Back

A key is a piece of information used in a cryptographic algorithm to encrypt or decrypt data.

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What does the Caesar cipher do?

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The Caesar cipher is a substitution cipher that shifts letters in the alphabet by a fixed number of places.

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What is the purpose of the CIA triad in information security?

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The CIA triad stands for Confidentiality, Integrity, and Availability, which are the core principles of information security.

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What is confidentiality in the context of cryptography?

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Confidentiality ensures that information is only accessible to those who have the correct key to decrypt it.

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What is letter frequency analysis?

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Letter frequency analysis is a technique used to break ciphers by studying the frequency of letters in the ciphertext.

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What is the Vigenère cipher?

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The Vigenère cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution based on a keyword.

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How does the Vigenère cipher differ from the Caesar cipher?

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The Vigenère cipher uses multiple shift values based on a keyword, while the Caesar cipher uses a single shift value.

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What is brute force in cryptography?

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Brute force is a method of cracking a cipher by trying every possible key until the correct one is found.