Papers by Keyword: Threshold Signature

Abstract: Based on Elliptic Curve cryptosystem, a threshold signature scheme characterized by (k, l) joint verification for (t, n) signature is put forward. After being signed by a signer company employing (t, n) threshold signature scheme, the information m is transmitted to a particular verifier company, and then the signature is verified through the cooperation of k ones from the verifier company with l members, so as to realize a directional transmission between different companies. Finally, the application examples of the company encryption communication system, the generating polynomial of company private key and public key were given. The security of this scheme is based on Shamir threshold scheme and Elliptic Curve system, and due to the advantages of Elliptic Curve, the scheme enjoys wider application in practice.

Abstract: The traditional threshold signature scheme is a combination of the digital signature scheme and the secret sharing scheme. Any group of t (threshold value) or more players can reconstruct the secret together but no group of fewer than t players can in secret sharing scheme. Because of this property of secret sharing scheme, the current threshold signature scheme has a natural weakness in the anti-collusion attack. A new threshold signature scheme based on the factorial decompose theorem is designed successfully without the secret sharing scheme in order to get the ability of anti-collusion attacks. It not only has the property of group signature and threshold signature, but also has some good features including traceability，robustness and resisting forgery attacks.