Weak data secrecy for time-sensitive data in MANET

Roberto Cascella



Content distribution in mobile ad hoc networks benefit from network coding in terms of error/loss protection and faster dissemination at the cost of exposing the data to intermediate nodes that are not the intended recipients. In these systems data secrecy is at risk and it can be guaranteed by using encryption as a straightforward method. However, this inevitably increases the communication costs and decreases the willingness to cooperate of intermediate nodes, which have no expectation of recovering the file. In this talk I present a novel incentive secrecy preserving scheme for time-sensitive data based on obfuscation: the source intentionally obscures the original file and informs only the intended recipients which file blocks are corrupted. This scheme, combined with network coding, preserves the data secrecy and, in the meantime, fosters the cooperation of intermediate nodes. Finally, I present two alternatives to increase the efficiency of our weak secrecy scheme and show its use in vehicular ad hoc networks. Note: This is a joint work done at Univ of Trento in collaboration with Z. Cao (UCLA), M. Gerla (UCLA), B. Crispo (UniTN) and R. Battiti (UniTN).

[Roberto Cascella]
[INRIA EPI Plančte]