The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 23, 1995
Filed:
Apr. 28, 1992
Charles W Kaufman, Northboro, MA (US);
Morrie Gasser, Hopkinton, MA (US);
Butler W Lampson, Cambridge, MA (US);
Joseph J Tardo, Concord, MA (US);
Kannan Alagappan, Cambridge, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
Apparatus for protecting the confidentiality of a user's password during a remote login authentication exchange between a user node and a directory service node of a distributed, public key cryptography system includes a specialized server application functioning as an intermediary agent for the login procedure. The login agent has responsibility for approving the user's login attempt and distributing a private key to the user. However, the login agent is not trusted with the user's password and is therefore a 'semi-trusted' node. In another aspect of the invention, a login protocol enables remote authentication of the user password without transmitting the password over the network.