{"633505":{"#nid":"633505","#data":{"type":"event","title":"Ph.D. Dissertation Defense - Mehrdad Tahmasbi","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ETitle\u003C\/strong\u003E\u003Cem\u003E:\u0026nbsp; \u003C\/em\u003E\u003Cem\u003ECovert Communications: from Classical Channels to Quantum Channels\u003C\/em\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003ECommittee:\u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Matthieu Bloch, ECE, Chair , Advisor\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. John Barry, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Justin Romberg, ECE\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Brian Kennedy, Physics\u003C\/p\u003E\r\n\r\n\u003Cp\u003EDr. Vladimir Koltchinskii, Math\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cstrong\u003EAbstract: \u003C\/strong\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003EThe objective of this dissertation is to study covert communications over classical and quantum channels. In contrast to the well-studied notion of secrecy, in which one attempts to protect the content of information, covertness constraint requires that the communication remains undetectable from an unwanted party warden. \u0026nbsp;A fundamental result states that the optimal number of transmitted bits scale as square root of the number of channel uses when covertness is achieved. \u0026nbsp;Many standard information-theoretic tools therefore fail in this zero-rate regime and one has to resort to finite-length analysis of a protocol. In the first half of this dissertation, we establish results pertaining the fundamental limits of covert communication over classical channels. In the second half of this dissertation, we investigate the fundamental limits of covert secret key generation, in which two parties attempt to generate a secret key \u0026nbsp;by using \u0026nbsp;a classical or quantum channel and a public authenticated channel.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Covert Communications: from Classical Channels to Quantum Channels "}],"uid":"28475","created_gmt":"2020-03-11 18:55:03","changed_gmt":"2020-03-16 21:12:55","author":"Daniela Staiculescu","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2020-03-23T10:30:00-04:00","event_time_end":"2020-03-23T12:30:00-04:00","event_time_end_last":"2020-03-23T12:30:00-04:00","gmt_time_start":"2020-03-23 14:30:00","gmt_time_end":"2020-03-23 16:30:00","gmt_time_end_last":"2020-03-23 16:30:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"434381","name":"ECE Ph.D. Dissertation Defenses"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"},{"id":"1808","name":"graduate students"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}