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The current default authentication method in TypePad and Movable Type's Atom implementation is WSSE. WSSE is a header containing a token based on username, password and date and looks like: X-WSSE: UsernameToken Username="name", PasswordDigest="digest", Created="timestamp", Nonce="nonce" I have implented a library in JavaScript to generate this header, quite useful for XmlHttpRequest and GM_XmlHtt
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