2026-03-17T16:25:41Z https://ipsj.ixsq.nii.ac.jp/oai

oai:ipsj.ixsq.nii.ac.jp:00212853 2025-01-19T17:21:02Z 581:10433:10442

A New Schnorr Multi-Signatures to Support Both Multiple Messages Signing and Key Aggregation A New Schnorr Multi-Signatures to Support Both Multiple Messages Signing and Key Aggregation Rikuhiro, Kojima Dai, Yamamoto Takeshi, Shimoyama Kouichi, Yasaki Kazuaki, Nimura Rikuhiro, Kojima Dai, Yamamoto Takeshi, Shimoyama Kouichi, Yasaki Kazuaki, Nimura [特集：Society 5.0を実現するコンピュータセキュリティ技術] multi-signature, interactive aggregate signature, Schnorr signature, trust service, eIDAS A digital signature is essential for verifying people's reliability and data integrity over networks and is used in web server certificates, authentication, and blockchain technologies. Specifically, to solve the bitcoin scalability problem, Multi-Signature (MS) schemes have recently attracted attention because the MS's aggregate algorithm can reduce the amount of signature data in transactions. While such schemes support only a single message signing, Interactive Aggregate Signatures (IAS) and Aggregate Multi-Signature Protocol (AMSP) support signing of multiple messages. However, there are some issues with these schemes, for example, key aggregation is unavailable. In this paper, we propose a key aggregatable IAS scheme called KAIAS that can sign multiple messages with key aggregation. In terms of cases using Multi-Signature, previous studies have mainly discussed the benefits of reducing the size of signatures. On the other hand, we also propose a practical application of KAIAS that leverages its benefits in aggregating both signatures and public keys with a low computing cost for verification. ------------------------------ This is a preprint of an article intended for publication Journal of Information Processing(JIP). This preprint should not be cited. This article should be cited as: Journal of Information Processing Vol.29(2021) (online) DOI　http://dx.doi.org/10.2197/ipsjjip.29.525 ------------------------------ A digital signature is essential for verifying people's reliability and data integrity over networks and is used in web server certificates, authentication, and blockchain technologies. Specifically, to solve the bitcoin scalability problem, Multi-Signature (MS) schemes have recently attracted attention because the MS's aggregate algorithm can reduce the amount of signature data in transactions. While such schemes support only a single message signing, Interactive Aggregate Signatures (IAS) and Aggregate Multi-Signature Protocol (AMSP) support signing of multiple messages. However, there are some issues with these schemes, for example, key aggregation is unavailable. In this paper, we propose a key aggregatable IAS scheme called KAIAS that can sign multiple messages with key aggregation. In terms of cases using Multi-Signature, previous studies have mainly discussed the benefits of reducing the size of signatures. On the other hand, we also propose a practical application of KAIAS that leverages its benefits in aggregating both signatures and public keys with a low computing cost for verification. ------------------------------ This is a preprint of an article intended for publication Journal of Information Processing(JIP). This preprint should not be cited. This article should be cited as: Journal of Information Processing Vol.29(2021) (online) DOI　http://dx.doi.org/10.2197/ipsjjip.29.525 ------------------------------ journal article 2021-09-15 application/pdf 情報処理学会論文誌 9 62 1882-7764 AN00116647 https://ipsj.ixsq.nii.ac.jp/record/212853/files/IPSJ-JNL6209004.pdf eng