Is TripleDES 168bit vulnerable to Differential Cryptanalysis? I was reading this paper. In the table-1 of the paper it says  TripleDES (showing both 128bit and 168bit keysize) is vulnerable to Differential Cryptanalysis. It also says that AES (showing all three keysize) is strong against Differential Cryptanalysis. If AES-128bit is secure against Differential Cryptanalysis then why not TripleDES-168bit as well?

So, is it the paper that the authors haven't made it clear or is it true that TripleDES 168bit keysize is vulnerable to Differential Cryptanalysis attack?
This claim is bogus. DES itself has a 13-round differential with probability around $2^{-47}$, so TripleDES with its 48 rounds is resistant to any sort of differential attack. 

The paper authors are not really competent in the subject.