Alice encrypts a message using the Counter (CTR) mode, and sends it to Bob. Mallory has intercepted the ciphertext. Although she does not know the entire message, she does know that the 17th byte of the plaintext is 1; she wants to change the value to something else (the rest of the messages should not be changed). Mallory does not know the encryption key, so she can only modify the ciphertext. (1) How can she do that