Meta bug for this. Most client-side work hangs off Bug 1013024.

Curtis, Mark: when would be a good time to talk through this and discuss mitigations for the horrors lurking within?

Sec review results, in very brief: * Measure SSL overhead. If low, we'll take it. * Explore a way to verify intent senders. * Note to self: double-check that we don't process an intent after first run. * Future/further thought: signature verification for downloaded zips. (More impetus for this if no SSL.)

Sec review granted.

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