首先请尝试检查本文:
WCF REST服务上的摘要式身份验证( http://www.codeproject. com/Articles/162726/WCF-REST-Service上的摘要式身份验证).

First please try check this article:
Digest Authentication on a WCF REST Service(http://www.codeproject.com/Articles/162726/Digest-Authentication-on-a-WCF-REST-Service).

然后，如果您只想验证登录服务，请尝试使用用户名验证.
具有自定义用户名密码身份验证的WCF服务( http://www.codeproject. com/Articles/96028/WCF-Service-with-custom-username-password-authenti ).

Then if you only want to authenticate the login service, try to use the username authentication.
WCF Service with custom username password authentication(http://www.codeproject.com/Articles/96028/WCF-Service-with-custom-username-password-authenti).

谢谢.