摘要：Under a completely open network, in order to ensure the security of communication, an effective scheme of certificateless multilevel proxy signature is designed by using bilinear pairings. Under the strongest security model, the scheme provides an formal safety certificate. The safety of the scheme is based on the difficulty in solving the Diffie-Hellman question. The scheme raised by this thesis possesses security characters: it is verifiable, undeniable, discernible and preventive from signature abuse. The multilevel proxy signature scheme also has the merit of flexibility and it is traceable to the backward as well as extensible to the forward. On account of its merits of security, high efficiency and flexibility, it can be extensively applied in electronic commerce, mobile agent system and so on.
