METHOD FOR HIDING THE IDENTITY OF COMMUNICATION DEVICES IN A CONTINUOUS GROUP KEY AGREEMENT

Abstract: methods for hiding the identity of communications devices in a continuous group key agreement are provided. a group member making a request relating to changing a group state provides a signed challenge value to a server, which signed challenge value has been signed using a group signature key. the server checks the signed challenge value to determine if the group member is in possession of the group signature key and is therefore a member of the group. as the group signature key is used, the server cannot determine the identity of the group member making the request.

Inventor(s): Keitaro HASHIMOTO, Shuichi KATSUMATA, Thomas PREST

CPC Classification: H04L9/0838 ({Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these (network architectures or network communication protocols for key exchange in a packet data network )})

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