Identity-Based Redactable Lamport Signature Scheme
Fang Zuo, Qianli Wang, Pu Cheng · Journal of Physics Conference Series · 2019
The Redactable Signature Scheme (RSS) is one of the hottest topics in cryptography in these years. We find that even if the revision of the source document is limited to a very small range, the revision still has a high practical value. Therefore, it is necessary to find a solution that allows the trusted user to make the above restricted modifications to the source document. What's more, anyone who needs to verify the security of the modifications can do this. In order to solve this practical problem, we tried to introduce identities in the Lamport signature scheme to establish associations between keys and people, so that let Alice who was the owner of a document and has signed document then can authorize Bob to modify the document and generate new valid signatures. After discussion, we proved that if the identity system we use is secure, then our redactable signature scheme is also secure.