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There is no such thing as 64 bit triple DES. Well, to be more precise, there is, but it is fully equivalent to single DES. If the first block decrypts and the rest doesn't then you're probably using the wrong mode of operation. Try a few others such as DES in CBC mode or CTR mode using a zero valued IV.


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This illustrates the importance of getting the key order right with 3DES two-key keying option. With the correct order of $k_1$, $k_2$, $k_1$ you get something that should be impossible to attack with current resources, while with the incorrect order in the question it is feasible to attack. The outer two encryption layers can be joined into a single ...



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