Techniques to process three-dimensional object files while maintaining privacy

A system for processing a three-dimensional (3D) object file in a privacy-preserving manner, comprising:

• a memory;
• a processing device operatively coupled to the memory, the processing device to:
• receive, from a remote computing device, a first encrypted file and a request, wherein the first encrypted file is an encrypted complement of an object file that comprises a specification of a 3D printable object, and the request is a request to process the first encrypted file to identify non-printable features of the 3D printable object;
• obtain an encrypted minimum feature file that describes a smallest printable feature of a 3D printer;
• compute a first encrypted Minkowski sum of the first encrypted file and the encrypted minimum feature file to generate an encrypted intermediate file, and send the encrypted intermediate file to the remote computing device;
• receive, from the remote computing device, a second encrypted file that comprises an encrypted complement of the encrypted intermediate file;
• compute a second encrypted Minkowski sum of the second encrypted file and the encrypted minimum feature file to generate an encrypted result file;
• and
• send the encrypted result file to the remote computing device, wherein the encrypted result file comprises encrypted information that describes non-printable features of the 3D printable object.

A non-transitory computer-readable storage medium having instructions stored thereon that, when executed by a processing device, cause the processing device to:

• receive, from a remote computing device, a first encrypted file and a request, wherein the first encrypted file is an encrypted complement of an object file that comprises a specification of a 3D printable object, and the request is a request to process the first encrypted file to identify non-printable features of the 3D printable object;
• obtain an encrypted minimum feature file that describes a smallest printable feature of a 3D printer;
• compute a first encrypted Minkowski sum of the first encrypted file and the encrypted minimum feature file to generate an encrypted intermediate file, and send the encrypted intermediate file to the remote computing device;
• receive, from the remote computing device, a second encrypted file that comprises an encrypted complement of the encrypted intermediate file;
• compute, by the processing device, a second encrypted Minkowski sum of the second encrypted file and the encrypted minimum feature file to generate an encrypted result file;
• and
• send the encrypted result file to the remote computing device, wherein the encrypted result file comprises encrypted information that describes non-printable features of the 3D printable object.