On 01/25/2017 02:41 PM, Robert J. Hansen wrote:
For that matter, I'm still in the dark as to what the big problem with three-key 3DES is. The best attack against it requires more RAM than exists in the entire world and only reduces it to 112 bits.
The main problem would be its 64-bit block size. Apparently there's a "practical" attack against 64-bit ciphers as used in TLS [1].
That's probably reason enough to avoid 3DES whenever possible (when a 128-bit cipher is available).
[1] https://eprint.iacr.org/2016/798
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