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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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -In cryptography, an encryption key is a variable value that is applied using an algorithm to a string or block of unencrypted text to produce encrypted text or to decrypt encrypted text. The length of the key is a factor in considering how difficult it will be to decrypt the text in a given message.
Detailed explanation-2: -Its length will typically be 128 – 256 bits, depending on the algorithm used, and it will have a very long life, possibly even indefinite. It must therefore be well protected, e.g. by using a hardware security module (HSM).
Detailed explanation-3: -The Repeating-key XOR cipher algorithm works with an encryption key with no constraint on its length, which makes it much stronger than a Single-byte XOR Cipher, where the encryption key length was restricted to a single byte.
Detailed explanation-4: -Encryption strength is often described in terms of the size of the keys used to perform the encryption: in general, longer keys provide stronger encryption.