Meet-In-The-Middle Attack: A cryptanalytic technique where the attacker attempts to break a cipher by essentially meeting in the middle of the encryption process. The attacker independently computes both the plaintext-to-ciphertext and ciphertext-to-plaintext transformations for a range of values and then matches them to uncover the cryptographic key. This type of attack often requires significant computational resources, but it can effectively reduce the security of a cipher.