I'm (desperately) looking for an icon to represent a Certification Authority, like the ones that sign X.509 certificates we use in secure e-commerce.
I need something which is concrete (not an abstract "idea" being depicted in a drawing) and conveys affordability, solidity, importance... I searched the Internet, finding stuff like this which is not impressive at all.
Well, I've seen somewhere a CA represented by a building which you can often see, mostly in the USA, for libraries, courthouses, and town halls. The 'front' of the building, endowed with columns and a typical triangular pediment, looks like the White House and recalls a Greek temple, somewhat.
I couldn't find a clip-art or icon of this kind of building, maybe because I search using the wrong keywords.
Can you help me?
EDIT: I'm searching for something like this, but less 'stylized' and less clip-artish.