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arXiv 2202.09807cs.CR
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一个 t-out-of-n 可删减签名方案

A t-out-of-n Redactable Signature Scheme

Masayuki Tezuka, Xiangyu Su, Keisuke Tanaka

AI总结:

针对政府和企业披露数字文档时的隐私保护需求,本文提出了 t-out-of-n 可删减签名方案,通过签名者、n个删减者和组合者协作,在一次性删减模型下基于配对聚合签名实现了安全构造。

摘要:

可删减签名方案允许移除已签名消息的部分内容而不使签名失效。目前,证明政府和企业签发的数字文档有效性的需求正在增加。然而,在披露文档时,政府和企业必须移除涉及个人的隐私信息。可删减签名方案适用于这种情况。本文引入了 t-out-of-n 可删减签名方案的新概念。该方案包含一个签名者、n 个删减者、一个组合者和一个验证者。签名者预先指定 n 个删减者和一个组合者,并生成消息 M 的签名。每个删减者决定他或她想要从消息中移除的部分,并生成一条删减信息。组合者从所有删减者处收集删减信息片段,提取出超过 t 个删减者想要移除的消息部分,并生成删减后的消息。我们考虑一次性删减模型,该模型仅允许对签名者生成的签名进行一次删减。我们形式化了 t-out-of-n 一次性删减可删减签名方案,定义了其安全性,并在随机预言机模型中给出了基于配对的聚合签名方案的构造。

英文摘要:

A redactable signature scheme allows removing parts of a signed message without invalidating the signature. Currently, the need to prove the validity of digital documents issued by governments and enterprises is increasing. However, when disclosing documents, governments and enterprises must remove privacy information concerning individuals. A redactable signature scheme is useful for such a situation. In this paper, we introduce the new notion of the t-out-of-n redactable signature scheme. This scheme has a signer, n redactors, a combiner, and a verifier. The signer designates n redactors and a combiner in advance and generates a signature of a message M. Each redactor decides parts that he or she wants to remove from the message and generates a piece of redaction information. The combiner collects pieces of redaction information from all redactors, extracts parts of the message that more than t redactors want to remove, and generate a redacted message. We consider the one-time redaction model which allows redacting signatures generated by the signer only once. We formalize the one-time redaction t-out-of-n redactable signature scheme, define security, and give a construction using the pairing based aggregate signature scheme in the random oracle model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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