| CPC H04L 9/3271 (2013.01) [H04L 9/3213 (2013.01); H04L 9/3247 (2013.01)] | 24 Claims |

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1. A secure challenge-response method, comprising:
requesting respective token challenges from devices;
receiving the respective token challenges from the devices;
providing the respective token challenges to a signing server;
receiving from the signing server a signature of an aggregation of the respective token challenges signed with a private key of the signing server; and
providing to a given device of the devices a request to perform an operation, the request including the respective token challenges and the signature of the aggregation of the respective token challenges.
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