知识与财富的链接
可验证定时签名（VTS）方案允许在给定的时间内对已知消息上的签名进行锁定,在执行时间为T的顺序计算后,任何人都可从时间锁（time-lock）中提取出该签名.可验证性保证了在无需解开时间锁的情况下,任何人都可以公开地验证时间锁中是否包含已知消息上的合理签名,且可以在执行时间T的顺序计算后获得该签名.提出了可验证的属性基定时签名（verifiable attribute-based timed signatures,VABTS）概念,并给出了一个可撤销和可追溯的VABTS方案（RT-VABTS）的具体构造.RT-VABTS方案可同时支持签名者身份隐私保护、动态的用户撤销、可追溯性和定时性,并能解决属性基密码中的密钥托管问题.VABTS具有非常广阔的应用前景,特别列举了VABTS的两种应用场景：构建准入区块链中隐私保护的支付通道网络和实现公平的隐私多方计算.最后,通过形式化的安全性分析和性能评估证明实例化的RT-VABTS方案是安全且高效的.
A verifiable timed signature (VTS) scheme allows one to time-lock a signature on a known message for a given amount of time T such that after performing a sequential computation for time T anyone can extract the signature from the time-lock. Verifiability ensures that anyone can publicly check if a time-lock contains a valid signature on the message without solving it first, and that the signature can be obtained by solving the same for time T. This study first proposes the notion of verifiable attribute-based timed signatures (VABTS) and gives an instantiation VABTS further. The instantiation VABTS scheme can not only simultaneously support identity privacy-preserving, dynamic user revocation, traceability, timing, but also solve the problem of key escrow in attribute-based scheme.
In addition, VABTS has many applications. This study lists two application scenarios of VABTS: building a privacy-preserving payment channel network for the permissioned blockchain and realizing a fair privacy-preserving multi-party computing. Finally, it is proved that the instantiation VABTS scheme is secure and efficient via formal security analysis and performance evaluation.
