| Summary: | 碩士 === 國立交通大學 === 資訊管理研究所 === 94 === Digital signature which is usually used in many kinds of digital documents and only generated by the original signer in this digital age may result in several inconveniences. So, in order to solve the dilemma that digital signatures can’t be generated without the original signer, some scholars proposed a new scheme called Proxy Signature. By the showing up of Proxy signature scheme, the original signer could designate a proxy to perform the signing by generating valid digital signatures on behalf of the original signer when it is not there. However, there is no suitable scheme which could be applied to the Ad-hoc network environment due to its loose structure and unstable topology of mobile nodes. In order to find out a new scheme that could be used in Ad-hoc network environment, I tried to collect and analysis advantages and disadvantages of every related scheme, for example, I try to incorporate the secret sharing mechanism of Threshold Proxy Signature into my new mechanism, besides, I also benefit from using the concept of El-Gamal to improve the security to make a more suited distributed nominative proxy signature mechanism for Ad-hoc network. At last, we will show better security and flexibility the new mechanism has by Manik Lal Das’s basic proxy signature scheme security requirements and Kaliskis’ methodology to perform computing time analysis.
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