2. Assume that Personal Identification Numbers (PINs) are formed by nine-digit combinations of numbers 0 to 9. Assume that an adversary is able to attempt 200 PINs per minute. a. Assuming no feedback to the adversary until each attempt has been completed,what is the expected time to discover the correct PIN? b. Assuming feedback to the adversary flagging an error as each incorrect digit isentered, what is the expected time to discover the correct PIN?
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