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From the audio part of the talk: Elliptic curves are considerably harder to implement correctly than RSA. DSA has expensive signature verification, and you're far more likely to create one signature and verify it many times than vice versa.

EDIT: Also, elliptic curves are heavily patented. I mentioned this in my talk (the audio portion, not the slides) but forgot when I woke up and started answering questions here this morning. :-)

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