PhD Position in Distributed Collaborative Systems Security

il y a 1 mois


VillerslèsNancy, Grand Est, France INRIA Temps plein
Context and Advantages of the Position

This PhD thesis will take place in the COAST team and will be supervised by Claudia-Lavinia Ignat, HDR, CRCN Inria, Inria center of Lorraine University, and Olivier Perrin, Professor, Lorraine University.

Mission and Objectives

We aim to propose a security mechanism adapted for distributed collaborative systems without a central authority. The security mechanism must deal with user access rights to shared documents as well as with end-to-end encryption of data with key management suitable for dynamic user groups. The mechanism must be easy to use and will be tested with users.

Challenges and Requirements

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.

Proposed Solution

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) 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.

Key Responsibilities
  • Study of existing access control mechanisms for collaborative systems
  • Elicitation of requirements for the envisaged security mechanism through case studies
  • Proposal of a group key management that satisfies the requirements
  • Study of CRDTs
  • Proposal of a composed CRDT that combines a CRDT for shared data with a CRDT for access rights with and that considers group key management operations
  • Implementation of the proposed security mechanism in MUTE
  • User studies on the proposed security mechanism
Requirements
  • Engineering and/or Master 2 degree in Computer science / Applied mathematics with an experience in computer networks.
  • Theoretical expertise: distributed systems, P2P networks, security
  • Good collaborative and networking skills, excellent written and oral communication in English
  • Good programming skills
  • Strong analytical skills
Benefits
  • Subsidized meals
  • Partial reimbursement of public transport costs
  • Leave: 7 weeks of annual leave + 10 extra days off due to RTT (statutory reduction in working hours) + possibility of exceptional leave (sick children, moving home, etc.)
  • Possibility of teleworking (after 6 months of employment) and flexible organization of working hours
  • Professional equipment available (videoconferencing, loan of computer equipment, etc.)
  • Social, cultural, and sports events and activities
  • Access to vocational training
  • Social security coverage
Salary

2100€ gross/month the 1st year



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