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Challenge/Response-based Authentication Challenge/Response based authentication protocol extensions to the QoS NSLP Could be reused by some architectures (3GPP, 3GPP2) with their C/R based authentication and key exchange protocol variant QoS Request (Identity) Entity requesting resource Entity performing QoS reservations Unauthorized (challenge) Entity authorizing resource request QoS Request+Response Success/Failure AAA-QoS (Identity) AAA-QoS (challenge) AAA-QoS (response) AAA-QoS (success/failure) |