The meet-in-the-middle attack is a known-plaintext, generic space-time tradeoff cryptographic attack against encryption schemes that rely on performing multiple encryption operations in sequence. It is the primary reason Double DES is not used, since a Triple DES key can be brute-forced by an attacker willing to spend enough memory and time using the technique.
Facts
Time Complexity
Time Complexity (category)Exponential Time -- O(2^n) 1 Sources
1. Meet-in-the-middle attack (Wikipedia)
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