![]() ![]() In a stronger form, the opponent should be unable to decrypt ciphertexts or discover the key even if he or she has a number of ciphertexts together with the plaintext for each ciphertext.At a minimum, an opponent who knows the algorithm and has access to one or more ciphertexts would be unable to decipher the ciphertext or figure out the key.The encryption algorithm must be strong. ![]() There are two requirements for secure use of conventional encryption: It takes the ciphertext and the secret key and produces the original plaintext.
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