1. Assume that we choose N (that is, K=14) as an encryption key in Caesarâ€™s cipher. What is the result Ci of the following (double) encryption

Ci = E (K,E(K, Mi))

where Mi is an arbitrary plaintext element?.

2. If at all possible, how many encryptions with key K=2 is needed before observing the same effect as in the previous example (with K=14)?