Phd Position F/m Security Mechanisms for
il y a 4 semaines
Le descriptif de l’offre ci-dessous est en Anglais_
**Type de contrat **:CDD
**Niveau de diplôme exigé **:Bac + 5 ou équivalent
**Fonction **:Doctorant
**Contexte et atouts du poste**:
This PhD thesis will take place in team COAST and will be supervised by Claudia-Lavinia Ignat, HDR, CRCN Inria, Inria center of Lorraine University and Olivier Perrin, Professor, Lorraine University.
**Mission confiée**:
We want to propose a **security mechanism** adapted for distributed collaborative systems without a central authority. The security mechanism has to deal with **user access rights** to the shared documents as well as with **end-to-end encryption** of data with **key management** suitable for dynamic user groups. The mechanism has to be **easy to use** and will be tested with users.
Existing access control mechanisms mainly based on a central authority feature several difficulties in the context of collaborative systems. In the case of a federation of organizations, agreeing on an authority that manages access rights is almost impossible. Lack of a central authority raises issues of group management such as joining and leaving the group as well as rights revocation. Indeed, it should be possible for a partner to revoke granted rights without contacting an external authority. Moreover, current access control mechanisms feature performance issues that are critical for real-time collaboration where the number of updates is high. Indeed, delays are too high for sending at each user action an access request and waiting for its answer from a trusted central authority which maintains the security policies.
In order to provide high data availability in collaborative systems, data is typically replicated and users are allowed to concurrently modify replicated data. In order to avoid the use of a central server that stores access rights, we propose that in addition to the replication of data, access rights are also replicated. CRDTs (Commutative Replicated Data Types) [1, 2] were proposed as suitable replicated data structures where parallel modifications are conflict free by construction. We want to propose **CRDTs for managing replicated data and replicated access control**.
Group key generation and revocation can be done in concurrency with modifications on the shared document and its access rights. The challenge is to **compose CRDTs for access rights and data synchronisation with group key management operations**.
**Bibliography**:
[1] Gérald Oster, Pascal Urso, Pascal Molli, and Abdessamad Imine. “Data Consistency for P2P Collaborative Editing”. In: Proceedings of the ACM Conference on Computer-Supported Cooperative Work - CSCW 2006. Banff, AB, Canada, 2006, pp. 259-267. isbn: 1-59593-249-6. doi: 10.1145/1180875.1180916.
[2] Marc Shapiro, Nuno M. Preguiça, Carlos Baquero, and Marek Zawirski. “Conflict-Free Replicated Data Types”. In: 13th International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2011. Oct. 2011, pp. 386-400. doi: 10.1007/978-3-642-24550-3_29.
[3] Ted Wobber, Thomas L. Rodeheffer, and Douglas B. Terry. “Policy-Based Access Control for Weakly Consistent Replication”. In: Proceedings of the 5th European Conference on Computer Systems. EuroSys ’10. Association for Computing Machinery, Apr. 2010, pp. 293-306. isbn: 978-1-60558-577-2. doi: 10.1145/1755913.1755943. (Visited on 04/01/2021).
[4] Asma Cherif, Abdessamad Imine, and Michaël Rusinowitch. “Practical Access Control Management for Distributed Collaborative Editors”. Pervasive and Mobile Computing. Special Issue on Information Management in Mobile Applications 15 (Dec. 2014), pp. 62-86. issn: 1574-1192. doi: 10.1016/j.pmcj.2013.09.004.
[5] Mathias Weber, Annette Bieniusa, and Arnd Poetzsch-Heffter. “Access Control for Weakly Consistent Replicated Information Systems”. In: Proceedings of International Workshop on Security and Trust Management. STM 2016. Springer International Publishing, Sept. 2016, pp. 82-97. isbn: 978-3-319-46598-2. doi: 10.1007/978-3-319-46598-2_6.
[6] Pierre-Antoine Rault, Claudia-Lavinia Ignat, and Olivier Perrin. “Distributed Access Control for Collaborative Applications using CRDTs”. In: Proceedings of 9th Workshop on Principles and Practice of Consistency for Distributed Data. Rennes, France, Apr. 2022. doi: 10.1145/3517209.3524826. hal: hal-03584553.
[7] Pierre-Antoine Rault, Claudia-Lavinia Ignat, and Olivier Perrin. “Access control based on CRDTs for Collaborative Dis
- tributed Applications”. In: The International Symposium on Intelligent and Trustworthy Computing, Communications, and Networking (ITCCN-2023), Proceedings of the 22nd IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom-2023). Exeter, UK, Nov. 2023. hal: hal-04224855.
[8] Florian Jacob, Luca Becker, Jan Grashöfer, Hannes Hartenstein. Matrix Decomposition: Analysis of an Access Control Approach on Transaction-based D
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