Q.DOT – Distributed Quantum Oblivious Transfer

EFFICIENCY AND SECURITY WITH QUANTUM

The need to protect the privacy of sensitive data collected by third parties has driven several measures taken at global level, in order to prevent the information from being analyzed and/or shared between different entities. There is a need for a solution that allows for the sharing and analysis of data, without compromising the privacy of the inputs of each entity.

This is achieved with a cryptographic concept titled Secure Multiparty Computation (SMC), which is based on operating data transfers with a fundamental primitive called Oblivious Transfer (OT).

Still, in order to make SMC a viable common practice, it is necessary that it has the capacity to process a large number of OTs securely and thus, the efficient and secure development of each OT becomes imperative – two characteristics in which quantum cryptography can provide an advantage.

ON THE WAY OF A QUANTUM INDUSTRIAL PROTOTYPE

Q.DOT project, started on October 2019 and with a duration of 32 months, aims to present a practical and scalable solution based on the integration of quantum technology for the generation and distribution of quantum keys, using Oblivious Transfer (OT).

The development of this technology opens doors to SMC applications, a methodology that allows for the joint computation of a shared result, based on the inputs of multiple entities while keeping these inputs private.

Capgemini Engineering participates in this project as project coordinator, leveraging its expertise on project management, requirements and use case definition, solutions integration, testing, and validation.

The goal is to develop an industrial prototype to demonstrate not only the generation and distribution of quantum keys, but also the benefits of SMC applications leveraged by quantum technologies, integrated in an automotive scenario.

THE PARTNERSHIP FOR SUCCESS

  • WHAT WE DO

     

    • Development of a protocol for the generation and distribution of oblivious keys (OKD);
    • Implementation of a quantum communication physical system based on single-photon encoded in the polarization;​
    • Integration of the protocol with the quantum communication physical system;​
    • Test and validation of the quantum technology developed for SMC use case.
  • TECHNOLOGIAL APPROACH

     

    • Quantum Key Generation and Distribution (QKGD);​
    • Oblivious Transfers (OTs);​
    • Secure Multiparty Computing (SMC).

TRANSFORM CHALLENGES INTO OPPORTUNITIES

The project began with the known challenges associated with the physical implementation of the proposed solution and achieving high key rates considering the realistic scenario of imperfect devices and the environment. There were also the challenges regarding the choice of a use-case that fully justifies the need for secure computation, and is versatile enough to have an impact on future real-life implementations of this concept.

During the project execution, there were additional challenges associated with the use-case design, namely, making it technologically as less complex as possible keeping the future end-users in mind. The use-case design was adapted to consider simpler scenarios while ensuring there were solutions available for general scenarios, if adopted in the future. Regarding the experimental setup stage, additional challenges arose regarding the prototype’s dimensions and cost-effectiveness, which are being tackled by making some simplifications in the setup.

IMPROVE OTS PERFORMANCE
WITH QUANTUM

The expected results from the project involve OTs with enhanced security, as well as reduced computational complexity. For instance, our solution is not susceptible to intercept-now-decrypt-later kind of attacks, that classical alternatives suffer from. Similar to other celebrated protocols of quantum cryptography, e.g., quantum key distribution (QKD), the performance of our OT solution is bound to improve with the technology. 

As the world enters the quantum era of communication, it is exciting to be at the forefront of the development of these technologies. We believe that the advances we are helping create will open unseen possibilities in different sectors of technology. Preeti Yadav Expert at Capgemini Engineering

WHY CAPGEMINI ENGINEERING?

Being true to its own DNA, Capgemini Engineering keeps pursuing the most innovative solutions to leverage the only constant in today’s world: ChangeWith an ever-rising computational power allied to novelties like quantum computation, cyberattacks are becoming more common. Capgemini Engineering is already looking for the solutions of tomorrow, exploring through the fields of quantum communications and cryptography for enhanced connectivity, safety, and privacy, to help our clients and partners make communications safer for everyone. 

POWERING THE FUTURE OF COMMUNICATIONS

This project will firstly allow us to gain experience in the area of OT-based cryptography, which is not yet as well explored as the key distribution-based solutions, for instance. Moreover, gathering experimental experience will also provide us with an idea of the associated practical challenges.

Applying these solutions to the multiparty computations involving distrustful participants will open the market of secure computation powered by quantum OTs, alongside the more established market of secure communication powered by quantum key distribution.