The idea behind a (t, n) threshold blind signature is that a user can ask at least t out of n players of a group to cooperate to generate a signature for a message without revealing its content. This paper first prese...The idea behind a (t, n) threshold blind signature is that a user can ask at least t out of n players of a group to cooperate to generate a signature for a message without revealing its content. This paper first presents a new blind signature scheme from Weil pairing on elliptic curves. Based on this scheme, a threshold blind signature scheme is proposed. It is efficient and has the security properties of robustness and unforgeability. In the proposed scheme, the group manger is introduced to take the role of distributing the group secret key to each player. However, he cannot forge the players to generate partial blind signatures (Each partial blind signature depends on not only the secret key of the player, but also a random number the player picks). Compared with a threshold signature with a trusted third party, its advantage is obvious; Compared with a threshold signature without a trusted third party, it is more simple and efficient.展开更多
In this paper, we propose a fair e-cash scheme based on [1]. On the one hand, User's anonymity is protected in our system ,On the other hand,bank can trace e-coin and owner of e-coin with the help of the group man...In this paper, we propose a fair e-cash scheme based on [1]. On the one hand, User's anonymity is protected in our system ,On the other hand,bank can trace e-coin and owner of e-coin with the help of the group manager ,so it can prevent laundering ,corruption and kidnapping ,and the security of the scheme is based on strong RSA assumption and decision Diffie-Hellman assumption.展开更多
基金Supported by the National 973 Project of China(No.G1999035803)the National Natural Science Foundation of China (No.60373104)the National 863 Project of China (No.2002AA143021)
文摘The idea behind a (t, n) threshold blind signature is that a user can ask at least t out of n players of a group to cooperate to generate a signature for a message without revealing its content. This paper first presents a new blind signature scheme from Weil pairing on elliptic curves. Based on this scheme, a threshold blind signature scheme is proposed. It is efficient and has the security properties of robustness and unforgeability. In the proposed scheme, the group manger is introduced to take the role of distributing the group secret key to each player. However, he cannot forge the players to generate partial blind signatures (Each partial blind signature depends on not only the secret key of the player, but also a random number the player picks). Compared with a threshold signature with a trusted third party, its advantage is obvious; Compared with a threshold signature without a trusted third party, it is more simple and efficient.
文摘In this paper, we propose a fair e-cash scheme based on [1]. On the one hand, User's anonymity is protected in our system ,On the other hand,bank can trace e-coin and owner of e-coin with the help of the group manager ,so it can prevent laundering ,corruption and kidnapping ,and the security of the scheme is based on strong RSA assumption and decision Diffie-Hellman assumption.
