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A comment on How is NSA breaking so much crypto?. Parent comment

Re:How is NSA breaking so much crypto? by dfc on Thursday October 15, 2015 @12:22AM (#10391324)
Are there reasons other than speed/resource-usage for not using 15-18? Or put another way do you prefer group #14 above all others or is #14 the lowest level of security you are comfortable with?
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Re:How is NSA breaking so much crypto? by cperciva on Thursday October 15, 2015 @12:36AM (#10391371)
Speed is the main reason. Going bigger doesn't gain you anything; in some cases it may lose you something since slower arithmetic makes it possible to exploit lower-bandwidth side channel attacks.
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