1. Assume that passwords are selected from six-character combinations of 26 lower-case alphabetio characters. Assume that an adversary is able to attempt passwords at a rate of 26 per second. a. Assuming no feedback to the adversary until each attempt has been completed, what is the expected time to discover the correct password? b. Assuming feedback to the adversary flagging an error as each incorrect character is entered what is the expected time to discover the correct password? c. Assume the system provides response to two characters immediately. It returns a yes or no (yes if both characters are correct otherwise it returns a no). what is the expected time to discover the correct password