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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Strength of algorithm
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Secrecy of key
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Length of key
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All of the above
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Detailed explanation-1: -Explanation: Encryption Strength is based on all of the above factors: Length of key, Secrecy of key and Strength of algorithm.
Detailed explanation-2: -The strength of encryption is related to the difficulty of discovering the key, which in turn depends on both the cipher used and the length of the key.
Detailed explanation-3: -The strength of an algorithm, is defined both in terms of it’s key size, as well as it’s resistance to cryptanalytic attacks. We say an algorithm is broken if there exists an attack better than brute force. So, with AES and a 128-bit key, AES is considered “secure” if there is no attack that less than 2^128 work.
Detailed explanation-4: -Explanation: DES is a symmetric key block cipher in which the block size is 64 bits and the key size is 64 bits. It is vulnerable to some attacks and is hence not that popularly used.
Detailed explanation-5: -Key size can be 128/192 or 256 bits. Encrypts data using 128-bit blocks. Triple DES is a method of encryption that employs three instances of DES on the same plaintext.