Question: Problem 3: DES Cipher Take a gray-level image of 8 bit depth in pgm format (or some other simple image format that directly represents the

Problem 3: DES Cipher Take a gray-level image of 8 bit depth in pgm format (or some other simple image format that directly represents the gray values without complicated encoding). Take DES and encrypt the image (using ECB mode or CBC mode). a. (Brutal force attack - 25 points) Try a brutal force attack on the ciphertext. Plot the relationship between key length and time consumed for the attack. (Since keys for DES are of 56-bit, you can simulate a key of n-bit (n

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