{"id":341006,"date":"2016-12-24T13:21:20","date_gmt":"2016-12-24T21:21:20","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&p=341006"},"modified":"2018-10-16T20:51:21","modified_gmt":"2018-10-17T03:51:21","slug":"constant-round-concurrent-zero-knowledge-bounded-player-model","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/constant-round-concurrent-zero-knowledge-bounded-player-model\/","title":{"rendered":"Constant-Round Concurrent Zero Knowledge in the Bounded Player Model"},"content":{"rendered":"

In [18] Goyal et al. introduced the bounded player model for secure computation. In the bounded player model, there are an a priori bounded number of players in the system, however, each player may execute any unbounded (polynomial) number of sessions. They showed that even though the model consists of a relatively mild relaxation of the standard model, it allows for round-efficient concurrent zero knowledge. Their protocol requires a super-constant number of rounds. In this work we show, constructively, that there exists a constant-round<\/em> concurrent zero-knowledge argument in the bounded player model. Our result relies on a new technique where the simulator obtains a trapdoor corresponding to a player identity by putting together information obtained in multiple sessions. Our protocol is only based on the existence of a collision-resistance hash-function family and comes with a \u201cstraight-line\u201d simulator.<\/p>\n

We note that this constitutes the strongest result known on constant-round concurrent zero knowledge in the plain model (under well accepted relaxations) and subsumes Barak\u2019s constant-round bounded concurrent zero-knowledge result. We view this as a positive step towards getting constant round fully concurrent zero-knowledge in the plain model, without relaxations.<\/p>\n","protected":false},"excerpt":{"rendered":"

In [18] Goyal et al. introduced the bounded player model for secure computation. In the bounded player model, there are an a priori bounded number of players in the system, however, each player may execute any unbounded (polynomial) number of sessions. They showed that even though the model consists of a relatively mild relaxation of […]<\/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":"Springer Berlin Heidelberg","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"19th International Conference on the Theory and Application of Cryptology and Information Security","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"19th International Conference on the Theory and Application of Cryptology and Information 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