Estimate the time required to crack a 56-bit DES key by a brute-force attack using a 500 MIPS (million instruction per second) workstation, assuming that the inner loop for a brute-force attack program involves around 10 instructions per key value, plus the time to encrypt an 8-byte plaintext

What will be an ideal response?


Suppose we have a computer with a 64-bit, 2000 MIP cpu, and a short sample (8 bytes or one 64-bit word) of plain text with the corresponding encrypted text.





i.e. about 500 years. A 200,000 MIPs parallel processor is 100 times faster, so assuming an efficient parallel algorithm, the cracking time would be ~5 years.





For IDEA, the equation is:


Computer Science & Information Technology

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