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As noted in the comments, HTTP_Authentication_Services supports HTTP Basic Authentication, which is an easy method to implement and is reasonably secure when used over SSL. As noted from the linked Wikipedia article, the rules for using HTTP Basic Authentication are as follows:
1. The username and password are combined into a string separated by a colon, e.g.: username:password
2. The resulting string is encoded using the RFC2045-MIME variant of Base64, except not limited to 76 char/line.
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