Efficient Platform for Traceable Collaborative Workflow Based on Digital Signature with Bi-Trapdoor Hash Function

In a collaborative workflow platform, when a group leader receives a document which requires cooperators’ support, she/he assigns the task to the cooperators. Each cooperator can modify the document in real-time and view the other cooperators’ modifications simultaneously. A worth-discussing problem in such environment is how to find the specific cooperator efficiently when some errors happen. Another problem is how to efficiently verify all the revisions stored on the platform. To deal with the problems, we first propose a novel bi-trapdoor hash function, and use it to construct a collaborative workflow platform. The proposed platform has three advantages: low computation cost in the online phase, rapid approach to finding the editor of a revision in a collaborative platform, and batch verification support for all revisions.