Solve all parts a,b & c step by step

Table Useful for Questions A2 and A5: As a cryptanalyst, you are able to acquire the following ciphertext, along with some known plaintext as indicated. Encryption is based on the Hill cipher using blocks of 2 symbols over Z26, synchronized so that the first 2 ciphertext symbols are a block. That is, the ciphertext blocks are [h, k], [c, u], [l, t ], etc. (Note that spaces, punctuation, and capitalization are removed from the plaintext before encryption.) Assume that English letters are mapped to plaintext/ciphertext symbols as shown in the table on p. 1. (a) Determine the decryption key. You may find the table on p. 1 useful for any necessary inverses. HINT: Avoid combining equations in your solution so that it is necessary to used to find x from " x2115(mod26)", since 2 has no inverse, whereas "3.x7(mod26)" can be used to solve for x from " x317(mod26)" since 31 exists. (b) From, the decryption key, compute the encryption key. (c) Decrypt the first 3 blocks of ciphertext