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Several alternative schemes have been presented in the literature to try to solve the users' admission problem in P2P systems when it is not possible to include a logically centralized authority (either online or offline) in the system. However, most of them are not suitable for on-the-fly P2P systems and the most typical ones (IP based, shared secret and threshold cryptography) have several security and performance drawbacks. From the deficiencies of the existing schemes, in this paper, the authors present a new decentralized certification scheme for on-the-fly P2P systems which is based on the recently published Internet Attribute Certificate Profile for Authorization.
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