I've opened https://github.com/rtcweb-wg/security-arch/pull/33 This changes the MTI cipher suites to ECDSA and does a little cleanup on the corresponding API requirements to more closely match what has just landed in the W3C specification. We discussed ECDSA and the only concerns raised were with compatibility. I've done some testing with other implementations with no issues, and ECDSA seems to be well supported on all those hard-to-upgrade PSTN gateways (thanks to Cullen and Ethan for helping out with checks there and to NIST for creating certification pressure with FIPS-2). I have an implementation that switches Firefox to ECDSA with P-256 by default. It's much, much faster. http://bench.cr.yp.to/ claims that it's 150 times faster on mobile devices for keygen.
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