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Trust is an important factor for autonomous distributed systems. Organic Computing systems feature self-organizing techniques to manage complex distributed systems. This paper introduces the delayed ack method to measure and calculate trust values of network entities based on direct observation. It is designed to do this with minimum overhead. We demonstrate the approach within our middleware OCμ...
The P2P applications employing supernode architecture become more and more popular, while the problem about supernode selection is still open. When selecting supernodes, current researches and application fields mainly focus on the capability criterion such as software and hardware. So this provides malicious node with a good chance to exert malicious behaviors because they can seriously damage the...
We 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...
Effectiveness of P2P systems highly depends on efficiency of their search algorithms. With existence of malicious and dishonest nodes, reputation systems are essential to evaluate the trustworthiness of participating peers and to combat subversive peer behaviors. Surprisingly majority of the available reputation systems, ignore the underlying search algorithm and assume it pre-existing. In this paper...
Because the P2P networkpsilas trust mechanism receives frequently cheat and attack from the malicious nodes, this paper identified four vulnerabilities that are detrimental to trust management, and presented a vague set-based anti-attacked trust model. This model used degree of membership to measure trust degree of uncertainty information, employed the time sensitive coefficient and the penalty coefficient...
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