I was reading How are possible uses for X.509 (SSL) certificates denoted? on IT SE. It begins with:
X.509 certificates can be used for servers, clients, email, code signing and more applications.
http://twitpic.com/6gdxaqindicates that a certificate...
The image refers specifically to an incident in 2011, where a rogue
google.com certificate from Diginotar had code-signing capability. I wanted to remove dependence on external service Twitpic for the sake of URL persistence. In trying to do so, I noticed something I've seen often, and don't understand. In this context, it refers to
cloudfront.net. I'm guessing that is because Twitpic uses Cloudfront as their content delivery network (CDN)?
I can't (easily) upload the image to IT SE, as Twitpic only offers a 150px square thumbnail
http://twitpic.com/show/thumb/6gdxaq.jpg. I don't know if Twitpic does this for security, or for SEO purposes. If the latter, it would ensure that viewers visit the Twitpic site in order to see a larger version. To view the full sized image in my browser, there is a Cloudfront domain URL
http://d3j5vwomefv46c.cloudfront.net/photos/large/390320594.jpg?with several portions appended. This is my question: What do key, Key-Pair-ID and Signature mean?
Is there a standardized nomenclature, and is it analogous to what is used for certificates, such as X.509 (SSL) which contain a keys and a signature? That was why I included so much information about the prior question, in case there were any actual or conceptual similarities.
Or does this pertain to authentication, instead of authorization?