We worked on the DESX, which we created by adding an XOR in front of and behind the DES. Let's cancel the first of these XORs (the one before DES). So, y = DESK (X) XOR kl (y ciphertext, x publictext, k and ki secret keys) a) Write the decryption function. b) Can a meet-in-the-middle attack be applied to this cipher? If applicable, how? If not, why? Explain. We worked on the DESX, which we created by adding an XOR in front of and behind the DES. Let's cancel the first of these XORs (the one before DES). So, y = DESK (X) XOR kl (y ciphertext, x publictext, k and ki secret keys) a) Write the decryption function. b) Can a meet-in-the-middle attack be applied to this cipher? If applicable, how? If not, why? Explain