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
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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