501 results about "Group key" patented technology

A method and apparatus for authenticating a sensor node in a sensor network. The method for authenticating a sensor node by a first sink node in a sensor network includes receiving an authentication request using an authentication ticket from the sensor node, identifying a second sink node which has issued the authentication ticket, decoding the authentication ticket using a group key, which is previously stored in correspondence to the second sink node to confirm the validity of the authentication ticket, when the second sink node is included in a neighboring node list, normally processing authentication for the sensor node, generating an authentication ticket using a group key of the first sink node, and transmitting the generated authentication ticket to the sensor node.

Principles of the invention provide one or more secure key management protocols for use in a communication environment such as a conferencing system. For example, a method for managing a conference between two or more parties in a communication system comprises the following steps. An identity based authenticated key exchange operation is performed between a conference management element of the communication system and each of the two or more parties seeking to participate in the conference, wherein messages exchanged between the conference management element and the two or more parties are encrypted based on respective identities of recipients of the messages, and further wherein the conference management element receives from each party during the key authentication operation a random key component that is computed based on a random number selected by the party. The conference management element sends to each party a set comprising the random key components computed by the parties. The conference management element receives from each party a random group key component, wherein the random group key component is computed by each party via a computation based on the random number used by the party during the key authentication operation and the random key components computed by a subset of others of the two or more parties seeking to participate in the conference. The conference management element sends to each party a set comprising the random group key components computed by the parties such that each party can compute the same group key for use in communicating with each other party through the conference management element.

The invention discloses a method for updating group key which includes steps as follows: an attribute network entity obtains GK according with a version number KV of a group sign GID and a group key GK, and a local boot key SK(GID) for deciphering an internal mobile user identifying code IMSI encrypted by GK provided by an user equipment; the attribute network entity generates new group key GKn according with GID, KVn, SK(GID) when KV differs from the local version number KVn; the attribute network entity generates updating key UK according with IMSI, user's authentication key K, uses UK for encrypting GID, KVn and GKn, and providing to an user equipment; the user equipment generates UK according with IMSI, K, deciphers out GID, KVn and GKn, updates the group key GK and the version number KV. The invention also discloses the attribute network entity and a communication system. The method can improve IMSI security and solve threaten of exposing IMSI.