Describe the meet-in-the-middle attack.
What will be an ideal response?
The meet-in-the-middle attack is an attack that makes use of a space-time trade-off. If you are willing to use more CPU time, you can reduce the memory requirement. For breaking 2DES, the time-memory product remains at 2112. The attacker attempts to find a value in each range and domain of the composition of two functions such that the forward mapping of one through the first function is the same as the inverse image of the other through the second function. In other words, the meet-in-the-middle attack quite literally attacks by finding the meeting point in the middle of the composed function.
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