This is essentially the encryption algorithm run in reverse. It takes the ciphertext and the secret key and produces the original plaintext. NSWERS Encryption Algorithm X Decryption Algorithm Ciphertext X X X Plaintext uestion : 44 B Save Back Next UESTION lil ........ The services are intended to counter security attacks, and they make use of one or more security mechanisms to provide the service. NSWERS Security mechanism Security service X X X X Security attack All of the above