Which technique can be used to make an encryption scheme more resistant to a known plaintext attack?

Question

Options

• AHashing the data before encryption
• BHashing the data after encryption
• CCompressing the data after encryption
• DCompressing the data before encryption

• A
  6% (2)
• B
  12% (4)
• C
  6% (2)
• D
  76% (26)

Explanation

Compressing the data before encryption is a technique that can be used to make an encryption scheme more resistant to a known plaintext attack. A known plaintext attack is a type of cryptanalysis where the attacker has access to some pairs of plaintext and ciphertext encrypted with the same key, and tries to recover the key or decrypt other ciphertexts. A known plaintext attack can exploit the statistical properties or patterns of the plaintext or the ciphertext to reduce the search space or guess the key. Compressing the data before encryption can reduce the redundancy and increase the entropy of the plaintext, making it harder for the attacker to find any correlations or similarities between the plaintext and the ciphertext. Compressing the data before encryption can also reduce the size of the plaintext, making it more difficult for the attacker to obtain enough plaintext- ciphertext pairs for a successful attack.

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