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AssigneeMicrosoft Corporation
InventorsArun Ayyagari, Daniel R. Simon, Bernard D. Aboba, Krishna Ganugapati, Timothy M. Moore, Pradeep Bahl
Estimating the term…
Disclosed are methods for a client, having established one set of security keys, to establish a new set without having to communicate with an authentication server. When the client joins a group, master session security keys are derived and made known to the client and to the group's access server. From the master session security keys, the access server and client each derive transient session security keys, used for authentication and encryption. To change the transient session security keys, the access server creates “liveness” information and sends it to the client. New master session security keys are derived from the liveness information and the current set of transient session security keys. From these new master session security keys are derived new transient session security keys. This process limits the amount of data sent using one set of transient session security keys and thus limits the effectiveness of any statistical attacker.
In a computing environment with a network group, an access client and an access server being members of the network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, a method for the access client to iteratively derive a transient session security key, the method comprising:
A computer-readable medium containing instructions for performing a method for an access client to iteratively derive a transient session security key, the access client and an access server being members of a network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, the method comprising:
In a computing environment with a network group, an access client and an access server being members of the network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, a method for the access server to iteratively derive a transient session security key, the method comprising:
A computer-readable medium containing instructions for performing a method for an access server to iteratively derive a transient session security key, an access client and the access server being members of a network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, the method comprising:
In a computing environment with a network group, an access client and an access server being members of the network group, a master security key being known to the access client and to the access server, a method for the access client or the access server to iteratively derive a transient session security key, the method comprising:
A computer-readable medium containing instructions for performing a method for an access server or an access client to iteratively derive a transient session security key, the access client and the access server being members of a network group, a master security key being known to the access client and to the access server, the method comprising:
In a computing environment with a network group, an access client and an access server being members of the network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, a method for iteratively deriving a transient session security key, the method comprising:
A computer-readable medium containing instructions for performing a method for iteratively deriving a transient session security key, an access client and an access server being members of a network group, the access client having authenticated itself to an authentication server serving the network group, the authentication resulting in a master security key known to the access client and to the authentication server, the method comprising:
Dependencies are inferred from the claim text.