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[Damien Goutte-Gattat]

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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