An Extension to HTTP : Digest Access Authentication. - John Franks; Phillip M. Hallam-Baker; Jeffery L. Hostetler; Paul J. Leach; Ari Luotonen; Eric W. Sink; Lawrence C. Stewart (RFC, 1997)

HTTP Authentication: Basic and Digest Access Authentication. - John Franks; Phillip M. Hallam-Baker; Jeffery L. Hostetler; Scott D. Lawrence; Paul J. Leach; Ari Luotonen; Lawrence C. Stewart (RFC, 1999)