What is XOauth and its relationship with OAuth?

Some OpenSocial containers use xoauth_security_token to sign requests instead of oauth_token and oauth_token_secret .

Is XOauth an alternative to OAuth? (*) Who is behind XOauth and where is the official specification?

Random Googling leads me to xoauth.py from the google-mail-xoauth-tools project, which simply points to its "XOAUTH authentication utilities."

(*) In addition, this should not be, because the container uses other oauth_xxx parameters next to xoauth_xxx.

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Where did you see the use of xoauth_security_token ? I googled and didn’t get a single hit.

XOAuth is a SASL authentication mechanism based on OAuth signatures. For example, it can be used for SMTP or IMAP authentication. It is also proposed there to make it the IETF standard as an official SASL mechanism. It is supported by Google and works well with Gmail to access SMTP and IMAP.

Additional information on how to implement and use:

http://code.google.com/apis/gmail/oauth/protocol.html

NTN.

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XOAUTH is a Microsoft extension for the OAuth protocol. http://msdn.microsoft.com/en-us/library/hh745374(v=exchg.80).aspx

Used for example. in the integration of Exchange + Sharepoint + Lync.

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