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Post Doc - Secure data exchange based on quantum keys: theory and practice

Caen, France
USD per year
Posted on:

About the role

There are today many experiments related to Quantum Key Distribution (QKD), especially around Paris and the Nice region in France. Those experiments only relate to key exchange, and the use of this quantum key to secure a sensitive message is generally done in a somewhat simplistic way. In this context, the overall objective of the post doc is to evaluate the security and efficiency of a security protocol integrating a quantum key distribution and any additional useful cryptographic mechanism.

More precisely, the post doc will first have to work on a complete security model in the quantum setting, for a protocol including a key exchange and the authenticated encryption of a message. The post doc will also have to provide a complete analysis of the security of different protocols implying quantum key distribution and authenticated encryption, in order to compare them with each other. Finally, the post doc will work on the implementation of several solutions for quantum key distribution and authenticated encryption in the context of existing internal projects, and in particular in the case where more than two nodes participate in the secure exchange of keys and messages.

Indeed, to date there is no security proof for a complete cryptographic protocol integrating quantum key distribution. Similarly, there is no formal comparison between the different solutions that may exist for key exchange and authenticated encryption, especially when taking into account quantum key distributiuon and in the special case of several actors (more than two) participating in secure exchanges. Finally, no study comparing the different practical implementations of a quantum key distribution solution has been carried out so far.

About you

The candidate must have very strong skills in cryptographic mechanisms, and in particular security protocols (authenticated key agreement, authenticated encryption), security proofs (reduction of the security of a protocol to the security of the cryptographic primitivesused), and the quantum attacker model.

Knowledge of the quantum key distribution mechanism would be very relevant, in order to enter very quickly into the issues specific to this post doc, and thus being able to better address the hard points relating to security proofs, and practical implementations combining quantum key distribution and more classical cryptographic mechanisms.

Implementation skills could be a plus, so that the post-doct is perfectly autonomous in the task assigned to him.

Additional information

This post doct will be carried out in a large international group in the field of telecommunications.

The post doc will be directly involved in Orange Group security issues. The post doc will be integrated into the Applied Cryptography Group of Orange Labs (ACG, which includes 12 researchers in cryptography, as well as 6 PhD students in this domain. The post-doct will have the opportunity to go to international conferences in the field of security and cryptography, both to present his own results, but also to attend presentations and meet other researchers and PhD students in his field. .

Eventually, the post doc will also be integrated into the Université Côte d'Azur research team working on quantum key distribution.

He will thus have access to both skills related to cryptography and quantum physics.


The ambition of the Innovation Division is to take Orange's innovation further and strengthen its technological leadership, by mobilizing our research capacities to foster responsible innovation for end-users, to clarify the Group's strategic choices term and influence the global digital ecosystem.

We train experts in today and tomorrow technologies, and ensure continuous improvement in the performance of our services and our efficiency. The Innovation Division brings together 6,000 employees worldwide dedicated to research and innovation, including 740 researchers. Holders of a global vision with a wide variety of profiles (researchers, engineers, designers, developers, data scientists, sociologists, graphic designers, marketers, cybersecurity experts, etc.), the women and men of Orange Innovation are attentive and work for countries, regions and business units to make Orange a trusted multi-service operator.

"Within Innovation, you will be integrated into a research team at the forefront of innovation and expertise on the networks of the future (5G+, virtualization, fixed-mobile convergence, mobile edge computing, Named Data networking, ).You will be part of a research ecosystem alongside engineers of studies in anticipation (shorter term) allowing the concrete implementation of the concepts studied, benefiting from simulation platforms (4G/5G)”.


Post Doc

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