1) Encrypt the message " No action ", using the Hill cipher. Show your calculation and the result a) In this question, 4 K 5 7 d det(K) 43 b) Then Decrypt the message, you need the multiplicative inverse of d det (K), which can be calculated by the Extended Euclidean Algorithm. The multiplicative inverse is given as d (43)mod 26 23 You can verify 43.23 mod 26 1