{"id":147964,"date":"2002-11-01T00:00:00","date_gmt":"2002-11-01T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/coca-a-secure-distributed-on-line-certification-authority\/"},"modified":"2018-10-16T20:00:20","modified_gmt":"2018-10-17T03:00:20","slug":"coca-a-secure-distributed-on-line-certification-authority","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/coca-a-secure-distributed-on-line-certification-authority\/","title":{"rendered":"COCA: A Secure Distributed On-line Certification Authority"},"content":{"rendered":"<div class=\"asset-content\">\n<p>COCA is a fault-tolerant and secure on-line certification authority that has been built and deployed both in a local area network and in the Internet. Extremely weak assumptions characterize environments in which COCA&#8217;s protocols execute correctly: no assumption is made about execution speed and message delivery delays; channels are expected to exhibit only intermittent reliability; and with 3t + 1 COCA servers up to t may be faulty or compromised. COCA is the first system to integrate a Byzantine quorum system (used to achieve availability) with proactive recovery (used to defend against mobile adversaries which attack, compromise, and control one replica for a limited period of time before moving on to another). In addition to tackling problems associated with combining fault-tolerance and security, new proactive recovery protocols had to be developed. Experimental results give a quantitative evaluation for the cost and effectiveness of the protocols.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>COCA is a fault-tolerant and secure on-line certification authority that has been built and deployed both in a local area network and in the Internet. Extremely weak assumptions characterize environments in which COCA&#8217;s protocols execute correctly: no assumption is made about execution speed and message delivery delays; channels are expected to exhibit only intermittent reliability; [&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":"","footnotes":""},"msr-content-type":[3],"msr-research-highlight":[],"research-area":[13547],"msr-publication-type":[193715],"msr-product-type":[],"msr-focus-area":[],"msr-platform":[],"msr-download-source":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-147964","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-systems-and-networking","msr-locale-en_us"],"msr_publishername":"Association for Computing Machinery, Inc.","msr_edition":"Transactions on Computer Systems (TOCS)","msr_affiliation":"","msr_published_date":"2002-11-01","msr_host":"","msr_duration":"","msr_version":"","msr_speaker":"","msr_other_contributors":"","msr_booktitle":"","msr_pages_string":"329-368","msr_chapter":"","msr_isbn":"","msr_journal":"Transactions on Computer Systems (TOCS)","msr_volume":"20","msr_number":"4","msr_editors":"","msr_series":"","msr_issue":"","msr_organization":"","msr_how_published":"","msr_notes":"","msr_highlight_text":"","msr_release_tracker_id":"","msr_original_fields_of_study":"","msr_download_urls":"","msr_external_url":"","msr_secondary_video_url":"","msr_longbiography":"","msr_microsoftintellectualproperty":1,"msr_main_download":"227194","msr_publicationurl":"http:\/\/www.acm.org\/","msr_doi":"","msr_publication_uploader":[{"type":"file","title":"cocatocs.pdf","viewUrl":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2002\/11\/cocatocs.pdf","id":227194,"label_id":0},{"type":"url","title":"http:\/\/www.acm.org\/","viewUrl":false,"id":false,"label_id":0}],"msr_related_uploader":"","msr_attachments":[{"id":0,"url":"http:\/\/www.acm.org\/"},{"id":227194,"url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2002\/11\/cocatocs.pdf"}],"msr-author-ordering":[{"type":"user_nicename","value":"lidongz","user_id":32673,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=lidongz"},{"type":"text","value":"Fred B. 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