USE BRUTE FORCE

(6 marks) Let K be a fixed element of Z26, and define the fixed permutation over Z26 as 012 3 4 5 67 8 9 10 12 13 14 15 16 17 18 19 20 21 22 23 24 25 23 13 24 0715 14 6 25 16 22 1 19 18 5 11 17 2 21 12 20 4 10 9 3 8 Consoler the stream cipher with the key stream element ti z26, where .. (K+1-1) mod 26, Encryption and e, (z) = (r(z) + z) mod 26. d,(y)-(n-1(y-z) mod 26) Write a C/C++program streamCipher to decrypt the following ciphertext which was encrypted by the above stream WRTCNRLDSAFARWKXFTXCZRNHNYPDTZUUKMPLUSOX NEUDOKLXRMCBKGRCCURR decryption using are done as follows: ipher