access authentication
Click on the red underlined text to get to the source
... and Digest. Both schemes employ a shared secret based mechanism for
access authentication. The Basic scheme is inherently insecure in
that it transmits user credentials in plain text. The Digest scheme
...
... Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A. and L. Stewart, "HTTP Authentication: Basic and Digest Access Authentication", RFC 2617draft, June 1999. ...