由於資訊科技進步神速，使得資訊應用與電腦網路成為現代化社會的表徵，因此結合資訊科技與群體決策工作的應用就愈顯重要。因應時代變革，以數位簽章取代傳統的簽名方法，除了可達到有效性、完整性和正確性的功能，並能提昇行政效率、簡化作業流程、提高生產力且達到安全的要求。本論文提出二種以群體導向為基礎的數位簽章技術，包括以權重為基底的群體導向數位簽章技術和以授權度為基底的群體導向數位簽章技術。第一種方法係依個人在群體中因不同的身分而有不同的授權度，再由合法成員的授權權重組成能代表群體的合法簽章，據以行事。第二種方法：依據群體中不同的授權策略，區分為高授權度、低授權度與門檻授度等三種模式，制定成員的簽章金鑰，待符合授權規定時，才能代表本群體對外簽章。本研究具有多項特色，二個最主要且明顯的優點為容易製作和高度的安全性；亦可應用在電腦網路上資料的廣播和會議金鑰的分配。

　　Digital signature is very important in the application of modern electronic data processing systems. Authorization mechanism is used to delimit the capability of representatives of an organization. In order to provide various approaches for the authorization mechanism, two group-oriented signature scheme are proposed in this thesis. The first proposed signature scheme weights the authority of a signatory according to the position or capability in an organization. Combining all the authority of the members, a weight for group-oriented signature is derived to represent their group. The other scheme has three kinds of authorizations. Their are high-authorized authorization mechanism, low-authorized authorization mechanism and threshold-authorized. The distinct are derived according to the predefined authorization strategy. The representative signature is generated by incorporating all signatures of members. The characteristics of the proposed scheme are multilateral. Two must significant advantages are easy implementation and high security. The proposed schemes are believed to be available for applications in computernetworks or interworks.