Compute without using a calculator: x such that 5^x mod 29 = 22 Enter the number you get between 0 and 28. (We will learn later that there such a number exists and is unique modulo 29). In a one-time pad, if a message m of length l is is encrypted with a key k = 0^l (i.e, k consists of all 0 s) then enc_k(m) = m. That is why, it is sometimes suggested to prohibit this key. In other words, the keyspace is restricted to strings which are all not zeros. The resulting cryptosystem is perfectly secure. True False