The following questions involve showing that double encryption using various ciphersystems is not better than a single encryption. In every case, be specific, that is, explain how the single encryption key is derived from the two double-encryption keys ko and k. a. Shift cipher (8 points) Note that a key for a shift cipher is always given as an integer between 0 and 25 inclusive. 1. Given a double shift cipher where k, = 10 and k = 12, give a single key that accomplishes the same encryption. 2. Given a double shift cipher where k, = 21 and k = 17, give a single key that accomplishes the same encryption. 3. Explain how to compute a single key that does the same thing as the double keys k, and k using a single shift.