A chosen-plaintext attack on two-key triple encryption noted by Merkle and Hellman is extended to a known-plaintext attack. The known-plaintext attack has lower memory requirements than the chosen-plaintext attack, but has a greater running time. The new attack is a significant improvement over a known-plaintext brute-force attack, but is still not seen as a serious threat to two-key triple encryption.

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Lecture Notes in Computer Science
School of Computer Science

Van Oorschot, P, & Wiener, M.J. (Michael J.). (1991). A known-plaintext attack on two-key triple encryption. In Lecture Notes in Computer Science. doi:10.1007/3-540-46877-3_29