{"id":166486,"date":"2014-04-15T00:00:00","date_gmt":"2014-04-15T00:00:00","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/msr-research-item\/cryptographically-verified-design-and-implementation-of-a-distributed-key-manager\/"},"modified":"2018-10-16T21:07:01","modified_gmt":"2018-10-17T04:07:01","slug":"cryptographically-verified-design-and-implementation-of-a-distributed-key-manager","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/cryptographically-verified-design-and-implementation-of-a-distributed-key-manager\/","title":{"rendered":"Cryptographically Verified Design and Implementation of a Distributed Key Manager"},"content":{"rendered":"<div class=\"asset-content\">\n<p>We present DKM, a distributed key management system with a cryptographically veri\ufb01ed code base. DKM implements a new data protection API. It manages keys and policies on behalf of groups of users that share data. To ensure long-term protection, DKM supports cryptographic agility: algorithms, keys, and policies can evolve for protecting fresh data while preserving access to old data. DKM is written in C# and currently used by several large data center applications. To verify our design and implementation, we also write a lightweight reference implementation of DKM in F#. This code closes the gap between formal cryptographic models and production code: Formally, the F# code is a very precise model of DKM: we automatically verify its security against active adversaries, using a re\ufb01nement type-checker coupled with an SMT solver and new symbolic libraries for cryptographic agility. Concretely, the F# code closely mirrors our production code, and we automatically test that the corresponding C# and F# fragments can be swapped without affecting the runtime behavior of DKM. To the best of our knowledge, this is the largest cryptographically-veri\ufb01ed implementation to date. We also describe several problems we uncovered and \ufb01xed as part of this joint design, implementation, and veri\ufb01cation process.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>We present DKM, a distributed key management system with a cryptographically veri\ufb01ed code base. DKM implements a new data protection API. It manages keys and policies on behalf of groups of users that share data. To ensure long-term protection, DKM supports cryptographic agility: algorithms, keys, and policies can evolve for protecting fresh data while preserving [&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":[{"type":"user_nicename","value":"tolga"},{"type":"user_nicename","value":"fournet"},{"type":"user_nicename","value":"danshu"}],"msr_publishername":"Microsoft Technical Report","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"MSR-TR-2014-48","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","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":"","msr_other_contributors":"","msr_speaker":"","msr_award":"","msr_affiliation":"","msr_institution":"","msr_host":"","msr_version":"","msr_duration":"","msr_original_fields_of_study":"","msr_release_tracker_id":"","msr_s2_match_type":"","msr_citation_count_updated":"","msr_published_date":"2014-04-15","msr_highlight_text":"","msr_notes":"","msr_longbiography":"","msr_publicationurl":"","msr_external_url":"","msr_secondary_video_url":"","msr_conference_url":"","msr_journal_url":"","msr_s2_pdf_url":"","msr_year":2014,"msr_citation_count":0,"msr_influential_citations":0,"msr_reference_count":0,"msr_s2_match_confidence":0,"msr_microsoftintellectualproperty":true,"msr_s2_open_access":false,"msr_s2_author_ids":[],"msr_pub_ids":[],"msr_hide_image_in_river":0,"footnotes":""},"msr-research-highlight":[],"research-area":[13560,13558],"msr-publication-type":[193718],"msr-publisher":[],"msr-focus-area":[],"msr-locale":[268875],"msr-post-option":[],"msr-field-of-study":[],"msr-conference":[],"msr-journal":[],"msr-impact-theme":[],"msr-pillar":[],"class_list":["post-166486","msr-research-item","type-msr-research-item","status-publish","hentry","msr-research-area-programming-languages-software-engineering","msr-research-area-security-privacy-cryptography","msr-locale-en_us"],"msr_publishername":"Microsoft Technical Report","msr_edition":"","msr_affiliation":"","msr_published_date":"2014-04-15","msr_host":"","msr_duration":"","msr_version":"","msr_speaker":"","msr_other_contributors":"","msr_booktitle":"","msr_pages_string":"","msr_chapter":"","msr_isbn":"","msr_journal":"","msr_volume":"","msr_number":"MSR-TR-2014-48","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":"217750","msr_publicationurl":"","msr_doi":"","msr_publication_uploader":[{"type":"file","title":"DKM Verification.pdf","viewUrl":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2014\/04\/DKM-Verification.pdf","id":217750,"label_id":0}],"msr_related_uploader":"","msr_citation_count":0,"msr_citation_count_updated":"","msr_s2_paper_id":"","msr_influential_citations":0,"msr_reference_count":0,"msr_arxiv_id":"","msr_s2_author_ids":[],"msr_s2_open_access":false,"msr_s2_pdf_url":null,"msr_attachments":[{"id":217750,"url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-content\/uploads\/2014\/04\/DKM-Verification.pdf"}],"msr-author-ordering":[{"type":"user_nicename","value":"tolga","user_id":34244,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=tolga"},{"type":"user_nicename","value":"fournet","user_id":31819,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=fournet"},{"type":"user_nicename","value":"danshu","user_id":31538,"rest_url":"https:\/\/www.microsoft.com\/en-us\/research\/wp-json\/microsoft-research\/v1\/researchers?person=danshu"}],"msr_impact_theme":[],"msr_research_lab":[],"msr_event":[],"msr_group":[],"msr_project":[169556],"publication":[],"video":[],"msr-tool":[169139],"msr_publication_type":"techreport","related_content":{"projects":[{"ID":169556,"post_title":"F7: Refinement Types for F#","post_name":"f7-refinement-types-for-f","post_type":"msr-project","post_date":"2008-05-29 08:34:41","post_modified":"2020-05-05 00:34:09","post_status":"publish","permalink":"https:\/\/www.microsoft.com\/en-us\/research\/project\/f7-refinement-types-for-f\/","post_excerpt":"F7 is an enhanced typechecker for the F# programming language, a dialect of ML. 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