Question: Assume that we are planning to decrypt the ciphertext which was encrypted with DES encryption. We are using an ordinary household computer with 2GHz processor.

Assume that we are planning to decrypt the ciphertext which was encrypted with DES encryption. We are using an ordinary household computer with 2GHz processor.

Estimate the amount of time necessary to crack DES by testing all 56-bit possible keys. Also estimate the similar time for AES encryption with 128-bit key. (Assume that machine takes 100 cycles per brute force against a single key)

Note: For this question, the exact answer is not as important as the approach to calculate the answer. Also explain the calculations in brief.

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