| Summary: | 碩士 === 朝陽科技大學 === 資訊工程系碩士班 === 101 === Due to the rapid development of the Internet, many applications of Internet are widely used. It brings convenient, but derives many problems. We often hear news about insider trading in different enterprises, the cheating case of engineer commercial spying, etc. The security of Internet becomes an important issue in the transaction. In this thesis, we proposed two schemes to apply in different environment.
In the first scheme, we defend against the illegal insider trading of enterprises to construct an investigator unearths illegal behavior via a subliminal channel. The scheme can let investigator safety to send the evidence to the organization. And we set an official agent to make both have fair arbitration. The second scheme focuses on e-bidding case. We proposed an electronic public engineering project bidding protocol via a subliminal channel. In the bidding phase, we use the blind signature based on ElGamal mechanism to protect bidder’s identity, also can prevent the insiders of Public Construction Commission to disclose bid information. And we use the arbitration mechanism to construct a secure and fair scheme to protect the rights benefit.
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