Blogger Cookie

Hey everyone, I am working on a program that auto posts to Blogger using HttpWebRequests, but I am having trouble decrypting the cookie that is sent with the data such as securitytoken, bgresponse, and a few others right before you submit the comment (need this info for the post data). I am wondering if anyone knows what Blogger Cookie's are encrypted in (md5?) or how I would be able to get this information. Thanks

I dunno but if you figure it out let me know. I want to do the same.