Digest authentication
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Microsoft Exchange 2007
An authentication method that prompts the user for a user name and a password, also called credentials, which are hashed with other data before being transmitted over the network. Digest authentication is available only on domains that have domain controllers that are running Microsoft Windows Server operating systems. [Exchange 2007]
Java
An authentication mechanism in which a Web application authenticates itself to a Web server by sending the server a message digest along with its HTTP request message. The digest is computed by employing a one-way hash algorithm to a concatenation of the HTTP request message and the client's password. The digest is typically much smaller than the HTTP request and doesn't contain the password.