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comment by user-inactivated
user-inactivated  ·  3896 days ago  ·  link  ·    ·  parent  ·  post: New Vulnerability Found in Every Single Version of Internet Explorer

You can prove a program, which can help in assurances of security. http://stackoverflow.com/questions/476959/why-cant-programs-be-proven

From a cursory search, I found this as an example of a formerly verified web browser: http://goto.ucsd.edu/quark/. I don't happen to know a lot about this approach (I know nothing about this approach, really), but I do know that you can make certain guarantees about security (I guess assuming there are no bugs in your implementation of what you've proven).