Table 2.1 Types of Attacks on Encrypted Messages Type of Attack Known to Cryptanalyst Ciphertext only Encryption algorithm Ciphertext Known plaintext .Encryption algorithm Ciphertext One or more plaintext-ciphertext pairs formed with the secret key Chosen plaintext .Encryption algorithm Ciphertext .Plaintext message chosen by cryptanalyst, together with its corresponding ciphertext generated with the secret key Chosen ciphertext ° ncryption algorithn Ciphertext .Purported ciphertext chosen by cryptanalyst, together with its corresponding decrypted plaintext generated with the secret key Chosen text .Encryption algorithm Ciphertext .Plaintext message chosen by cryptanalyst, together with its corresponding ciphertext generated with the secret key .Purported ciphertext chosen by cryptanalyst, together with its key esponding decrypted plaintext generated with the secret corre wit 2021/1/27 Cryptography and Network Security-2 23/812021/1/27 Cryptography and Network Security - 2 23/81