Abstract:

In order to improve the security of identity based cryptography in Ad Hoc networks, we propose an adaptive distributed private key generator (DPKG) scheme, in which the server nodes that provide DPKG service are not fixed but are dynamically chosen by all the nodes during the operation of the network. Each node in the Ad Hoc network is assigned with a credit value which changes with the valid accusations messages sent by the nodes in the network, and the n nodes with the highest credit values automatically become servers. The security risks caused by the static server nodes in the traditional DPKG are avoided in the scheme and the leakage probability of the PKG's secret key is greatly decreased, so the ability of resisting attackers outside of the Ad Hoc networks is improved effectively.

Key words: identity based cryptography;network security;distributed;private key generator;key management;credit value