Productivity
Debugging
In this post, I’ll demonstrate a proposal called Convergence, which attempts to detect targeted attacks against HTTPS traffic—for instance, from within a specific locale or country.
Here’s how Convergence works: when the client connects to a HTTPS site, it obtains its certificate. It then consults a set of servers around the world, called notaries, and checks to see whether the site in question is sending the same certificate to all of those servers as well.