28d936491df8977af35c6227152ddc9a mathematics_10_02548.pdf 6e5d579f57dccada463663d9fb72618f219e2671 mathematics_10_02548.pdf 766348d4be4dd6ee00bc55f41051de2eea453f5c6f50e392ce14b172032bcdd7 mathematics_10_02548.pdf Title: Attribute Based Pseudonyms: Anonymous and Linkable Scoped Credentials Subject: Attribute-based credentials (ABCs) provide an efficient way to transfer custody of personal and private data to the final user, while minimizing the risk of sensitive data revelation and thus granting anonymity. Nevertheless, this method cannot detect whether one attribute has been used more than once without compromising anonymity when the emitter and consumer collude with one another. The protocol proposed in this article deals with this issue by using a modification of ZSS pairing-based short signatures over elliptic curves and Verheul's self-blinded credentials scheme. Each user can generate an identifier (pseudonym) that is unique and verifiable by everyone in a given scope, without compromising anonymity. However, the identifier cannot be reused in the same scope, since such reuse would be detected. Keywords: attribute-based credentials; pseudonyms; privacy-preserving credentials; self-blinded scheme; security proofs; user-centered system Author: Francesc Garcia-Grau, Jordi Herrera-Joancomartí and Aleix Dorca Josa Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Fri Jul 22 07:39:02 2022 CEST ModDate: Fri Jul 22 07:48:53 2022 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 14 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 381867 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- KUFHMQ+URWPalladioL-Bold Type 1 Custom yes yes no 10 0 BCUQJG+URWPalladioL-Roma Type 1 Custom yes yes no 15 0 PPJRPM+URWPalladioL-Ital Type 1 Custom yes yes no 19 0 DVTHKG+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 37 0 ABPROF+CMR10 Type 1 Builtin yes yes no 65 0 NHZFBP+CMSY10 Type 1 Builtin yes 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yes no 193 0 TBVDSU+CMSSI10 Type 1 Custom yes yes no 196 0 ABPROF+CMR10 Type 1 Custom yes yes no 202 0 Jhove (Rel. 1.22.1, 2019-04-17) Date: 2023-06-27 03:31:10 CEST RepresentationInformation: mathematics_10_02548.pdf ReportingModule: PDF-hul, Rel. 1.12.1 (2019-04-17) LastModified: 2023-06-23 08:51:10 CEST Size: 381867 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 345 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@44c8afef Item: Title: State of the Art Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7b69c6ba Item: Title: Preliminaries Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@46daef40 Children: Item: Title: Bilinear Pairings Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@12f41634 Item: Title: Cryptographic Problems in Additive Groups Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@13c27452 Item: Title: A Short Signature Scheme from Pairings Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@262b2c86 Item: Title: Non-Interactive Zero-Knowledge Proofs Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@371a67ec Item: Title: The Proposed Protocol Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@5ed828d Children: Item: Title: Overview Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@50d0686 Item: Title: Actors Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7a3d45bd Item: Title: Key Generation Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1e7c7811 Item: Title: Issuance of Anonymous Credentials: U -3.45muAP Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77ec78b9 Item: Title: Presentation of Credentials: U -3.45muSP Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1a3869f4 Item: Title: Security Analysis Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@a38d7a3 Children: Item: Title: Unforgeability Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77f99a05 Item: Title: User Anonymity Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@63440df3 Item: Title: Identifier Unlinkability between Scopes Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@3aeaafa6 Item: Title: Identifier Reusability Detection within the Same Scope Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@76a3e297 Item: Title: Conclusions and Future Line of Research Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@4d3167f4 Item: Title: References Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@ed9d034 Info: Title: Attribute Based Pseudonyms: Anonymous and Linkable Scoped Credentials Author: Francesc Garcia-Grau, Jordi Herrera-Joancomartí and Aleix Dorca Josa Subject: Attribute-based credentials (ABCs) provide an efficient way to transfer custody of personal and private data to the final user, while minimizing the risk of sensitive data revelation and thus granting anonymity. Nevertheless, this method cannot detect whether one attribute has been used more than once without compromising anonymity when the emitter and consumer collude with one another. The protocol proposed in this article deals with this issue by using a modification of ZSS pairing-based short signatures over elliptic curves and Verheul's self-blinded credentials scheme. Each user can generate an identifier (pseudonym) that is unique and verifiable by everyone in a given scope, without compromising anonymity. However, the identifier cannot be reused in the same scope, since such reuse would be detected. 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