In which method used in cryptanalysis does the attacker know a portion of the plaintext and the corresponding ciphertext?​

In which method used in cryptanalysis does the attacker know a portion of the plaintext and the corresponding ciphertext?​

  • brute-force
  • ciphertext
  • chosen-plaintext​
  • meet-in-the-middle
    Answers Explanation & Hints:

    There are several methods used in cryptanalysis:Brute-force – The attacker tries every possible key knowing that eventually one of them will work.
    Ciphertext – The attacker has the ciphertext of several messages encrypted but no knowledge of the underlying plaintext.
    Known-Plaintext – The attacker has access to the ciphertext of several messages and knows something about the plaintext underlying that ciphertext.
    Chosen-Plaintext – The attacker chooses which data the encryption device encrypts and observes the ciphertext output.
    Chosen-Ciphertext – The attacker can choose different ciphertext to be decrypted and has access to the decrypted plaintext.
    Meet-in-the-Middle – The attacker knows a portion of the plaintext and the corresponding ciphertext.​

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