YouTube - Encrypted cookie string

Posted by Robertof on Stack Overflow See other posts from Stack Overflow or by Robertof
Published on 2010-04-28T21:31:53Z Indexed on 2010/04/28 21:37 UTC
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encryption

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encrypt

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Hello!
I'm new to Stack Overflow.

I'm building a YouTube Downloader in PHP. But YouTube have some IP-checks.
Because the PHP file is on a remote server, the ip of the server != the ip of the user and the video-download fails.
So, maybe I've found a solution. YouTube sends a cookie with an encrypted string, which is the user IP. I need to know the encrypted-string algorithm and know how to crypt a string with this.
Here there is the string: nQ0CrJmASJk .
It could be base64, but when I try to decode it with base64_decode, it gives me strange characters.
You could check the cookie by requesting the main page of youtube, and check the headers "Set-Cookie". You will found a cookie with the name "VISITOR_INFO1_LIVE". Here there is the encrypyed string.
Anyone knows what is the algorithm? Thanks.
PS: sorry for my bad english.

Cheers,
Roberto.

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