OFD file signature information calculation method based on ring signature technology

The invention discloses an OFD (Open Forwarding Detection) file signature information calculation method based on a ring signature technology, which does not depend on a traditional signature scheme that signature information is generated by a public and private key pair of a user, and a signature user generates a legal signature by joint calculation based on public keys of a plurality of legal users and public and private keys of the user. A signature verifier cannot unlock the real identity of the signature user on the premise of verifying the legality of the file. According to the method, the protection of the user identity privacy of the original OFD file is realized under the scenes of special OFD file circulation and user anonymous requirements such as electronic anonymous voting and electronic anonymous bidding. 本发明公开了一种基于环签名技术的OFD文件签名信息计算方法，该方法不依赖于传统签名方案中由用户个人的公私钥对生成签名信息，而由签名用户基于多个合法用户的公钥和本人公私钥联合计算生成合法签名，签名验证者可在验证文件合法性的前提下无法解开签名用户的真实身份。本发明解决了在特殊OFD文件流通且有用户匿名需求如电子匿名投票、电子匿名投标等场景下，实现对原始OFD文件用户身份隐私的保护。