Just brute force basically But there seems to be smarter attacks (ref 21) https:...

tptacek · on Sept 1, 2015

Those are not practical attacks. But your argument hinges on their being non-theoretical attacks on 3DES. Are there others you were thinking of?

raverbashing · on Sept 1, 2015

3DES might have been a bad example.

My point is that even if today some sizes and lengths seem only of theoretical concern, tomorrow there might be a vulnerability, a new approach to the problem, or even natural technological evolution that might turn it into a practical attack (even when it seems impossible today)

tptacek · on Sept 1, 2015

But that's true of every cryptographic primitive. You can't make reasoned decisions based on that logic.

rwiggins · on Sept 1, 2015

From what I recall, the consensus is that the smarter attack is less efficient than brute force overall.