Research And Application On Controllability Of Redactable Signature

Electronic signature technology can guarantee the authenticity and validity of data,and has the characteristics of unforgeability and non-repudiation,but it's security requirements can't meet the requirements of revising the signed data and hiding the original information while maintaining the validity of the signature.In this regard,some studies proposed the redactable signature that supports the revision of signed data and can obtain the valid signature of the revised data.Since the redactable signature can obtain the valid signature of any subdata by default,there is a problem that the internal connection of the original content is destroyed due to the wrong revision operation,and it is even the vulnerability is exploited by malicious revisionists.Although some existing schemes support the restriction of the revision behavior by setting revision constraint information,they don't support the expression of all revision constraints.In response to the problems aforementioned,I analyze the revision constraint expression and implementation methods of the existing redactable signature schemes,and propose a revision constraint expression method based on the logic expression-like hash tree structure,and combine this method to propose a redactable signature scheme which support the expression of all revision constraints,and can authorize others to add and revise the constrained.At the same time,I define the model and it's properties of the scheme,and give proof of it's properties.My analysis shows that compared with other solutions,this scheme has stronger revision constraint capabilities,supports the expression of all revision constraints,and allows others to be authorized to make additional settings for revision constraints,so that the signer and the reviser have more control over the content of the data.Finally,based on the proposed scheme,I design and implement a web-based redactable signature tool,which provides a WYSIWYG operation interface,and lowers the threshold for users to use redactable signature.At the same time,in order to improve the operating efficiency of the tool,I design an efficient redactable signature scheme for the ordered tree structure.Through my experimental analysis,this scheme has higher efficiency than other schemes when there are a large number of child nodes in the parent node of the tree structure document.