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Content distribution systems 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 paper, the authors propose an incentive secrecy preserving scheme based on obfuscation for time-sensitive data. The source intentionally obscures the original file and informs only the intended recipients which file blocks are corrupted.
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