Enabling Secure Secret Sharing in Distributed Online Social Networks

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Executive Summary

The authors study a new application of threshold-based secret sharing in a Distributed Online Social Network (DOSN), where users need a means to back up and recover their private keys in a network of untrusted servers. Using a simple threshold-based secret sharing in such an environment is insufficiently secured since delegates keeping the secret shares may collude to steal the user's private keys. To mitigate this problem, they propose using different techniques to improve the system security: by selecting only the most reliable delegates for keeping these shares and further by encrypting the shares with passwords. They develop a mechanism to select the most reliable delegates based on an effective trust measure.

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