{"id":160348,"date":"2006-01-01T00:00:00","date_gmt":"2006-01-01T00:00:00","guid":{"rendered":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/msr-research-item\/how-to-win-the-clone-wars-efficient-periodic-n-times-anonymous-authentication\/"},"modified":"2018-10-16T20:15:30","modified_gmt":"2018-10-17T03:15:30","slug":"how-to-win-the-clone-wars-efficient-periodic-n-times-anonymous-authentication","status":"publish","type":"msr-research-item","link":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/how-to-win-the-clone-wars-efficient-periodic-n-times-anonymous-authentication\/","title":{"rendered":"How to Win the Clone Wars: Efficient Periodic n-Times Anonymous Authentication"},"content":{"rendered":"<div class=\"asset-content\">\n<p>We create a credential system that lets a user anonymously authenticate at most &#8216;n&#8217; times in a single time period. A user withdraws a dispenser of &#8216;n&#8217; e-tokens. She shows an e-token to a verifier to authenticate herself; each e-token can be used only once, however, the dispenser automatically refreshes every time period. The only prior solution to this problem, due to Damgaard et al.[DDP05], uses protocols that are a factor of &#8216;k&#8217; slower for the user and verifier, where &#8216;k&#8217; is the security parameter. Damgaard et al. also only support one authentication per time period, while we support &#8216;n&#8217;. Because our construction is based on e-cash, we can use existing techniques to identify a cheating user, trace all of her e-tokens, and revoke her dispensers. We also offer a new anonymity service: glitch protection for basically honest users who (occasionally) reuse e-tokens. The verifier can always recognize a reused e-token; however, we preserve the anonymity of users who do not reuse e-tokens too often.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We create a credential system that lets a user anonymously authenticate at most &#8216;n&#8217; times in a single time period. A user withdraws a dispenser of &#8216;n&#8217; e-tokens. She shows an e-token to a verifier to authenticate herself; each e-token can be used only once, however, the dispenser automatically refreshes every time period. The only [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"ACM","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"11","msr_page_range_start":"11","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"Jan Camenisch, Susan Hohenberger, Anna Lysyanskaya, Mira 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