A Secure Group-Oriented Secret Sharing Scheme

• Main Authors: Lin, Tzong Horng, 林宗宏
• Other Authors: Chang, Chin Chen
• Format: Others
• Language: en_US
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/48664961404996730326

碩士 === 國立中正大學 === 資訊工程研究所 === 81 === In the past, secret information transmission and cryptoanalysis were only concerned with person to person communication. Recently , the network systems have become more and more popular, and various kinds of information security have become very important topics. It is also well-known that groups such as schools, governments, private enterprises, and organizations are very important in the real world. Fast and secure information transmission is now also an important objective for each group. In this thesis a new generalized cryptosystem for Group-Oriented Cryptography (GOC) is proposed. In this scheme, the system only needs to store a set of the users'' secret keys, where each user can select his own secret key freely. The scheme allows the sender to group receivers into access instances, and then disjunctively combine these access instances into an access structure. A secret can only be decoded by utilizing all the secret keys owned by the users of any access instance. An important contribution of our scheme is that when two companies want to transmit messages to each other, the sender does not need to know the structure of the company which will receive the messages.