Question

Which of the following is a brute force attack that has been used to break DES...

Which of the following is a brute force attack that has been used to break DES encryption algorithm?

a. Stealing the encryption key

b. Using special purpose computers

c. Apply meet-in-middle attack

d. Eavesdropping

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Answer #1

b. Using special purpose computers

A brute force attack is checking systematically all possible keys until the correct key is found.

The worst-case scenario involves traversing the entire search space. But it will always find a solution.

The number of possibilities is determined by the key size in bits.

Since the DES only has a key of 64bits, the number of possible combinations are small and a personal computer can break it in a few days. Thats the reason why DES lost its credibility and not in use.

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