1:(Encryption and Decryption) The function E(x)=(ax+b) MOD 26 defines a valid Affine cipher of a letter ' x '. the coefficients ' a ' and ' b ' are integers between 0 and 25 . and ' a ' has to be relatively prime to 26 . Recall that the numerical equivalents of the English letters are as follows: 1) Encrypt the plaintext "NETWORK SECURITY" with the Affine cipher E(x)=(7x+2)mod26. (1 pt) 2) Find E1(y)=(cy+d) MOD 26, the inverse function of E(x), or the decryption function. (1 pt) E1(y) : "QWIDMFER YQGEPQE". (1 pt)