In the last geek dinner in Palo Alto with Scoble and others, one of the things we talked about was how blogosphere tend to build trust.  If you have been reading a blog for a while, you get to know the blogger.  A blogger whose blog is more than a year old and has many thoughtful posts, the blogger has created a foundation for trust just as a person who lived at the same address for 10 years does.

Why not put shape to that trust with a security certificate?  Services that has been monitoring and possibly archiving blogs for a while, like Technorati and Feedster, can measure how old a blog is and how active it has been and then issue a set of certs to the blogger based on that information and others.  We can then use the certs within the blogosphere for signing, identifying, and encrypting.