US Patent 10333715 Providing computation services with privacy

Techniques are provided for providing a local computation service on client device authorized by a remote service provider while keeping local data private from the remote service provider. In one example, a computer-implemented method comprises transmitting, by a device operatively coupled to a processor, a homomorphic encryption public key and homomorphically encrypted input data to a service provider. The computer-implemented method also comprises receiving, by the device from the service provider, a homomorphically encrypted signature generated based on the homomorphic encryption public key, the homomorphically encrypted input data, and a homomorphic encryption equivalent defined function. The computer-implemented method also comprises in response to a determination, based on a defined function corresponding to the homomorphic encryption equivalent defined function, that the homomorphically encrypted signature and input data corresponding to the homomorphically encrypted input data are valid for a computation service, performing, by the device, the computation service on the input data.