{"id":31472,"date":"2021-03-12T12:40:09","date_gmt":"2021-03-12T17:40:09","guid":{"rendered":"https:\/\/www.bu.edu\/cise\/?page_id=31472"},"modified":"2021-06-30T18:22:15","modified_gmt":"2021-06-30T22:22:15","slug":"may-25-2016-sidharth-jaggi-cuhk-2","status":"publish","type":"page","link":"https:\/\/www.bu.edu\/cise\/programs\/center-wide-programs-2\/cise-seminars\/2015-2016-cise-seminars-lecs-workshops\/may-25-2016-sidharth-jaggi-cuhk-2\/","title":{"rendered":"May 25, 2016, Sidharth Jaggi (CUHK)"},"content":{"rendered":"

Wednesday, May\u00a025,\u00a02016, 3-4 pm
\n15 St. Mary\u2019s Street,\u00a0Room 105
\nRefreshments at\u00a02:45 pm<\/p>\n

\"jaggi\"<\/h3>\n

Sidharth Jaggi
\nChinese University, Hong Kong<\/h3>\n

 <\/p>\n

 <\/p>\n

Deniable\/Covert\/Stealthy\/LPD communication<\/span><\/h3>\n

The urge to communicate, to speak and be heard, is a fundamental human need. However,\u00a0embedded within our increasingly sophisticated communication networks, Big Brother is often watching.\u00a0There are situations where even the fact that communication is happening (not just the content of that\u00a0communication), can have real-world consequences. For instance, if you are a politically active citizen in an\u00a0authoritarian society with broad censorship powers, the mere fact that you are communicating with the\u00a0outside world can be construed by those authorities as sufficient justification for reprisals.\u00a0<\/span><\/p>\n

There has been a flurry of recent work in the information theory community dealing with this problem. In\u00a0general, this problem encompasses models of communication with dual goals. Firstly, all communication\u00a0from the source (Alice) to the destination (Bob) should be reliable, i.e., the communication protocol should\u00a0be resilient to random noise, and perhaps even active jamming. Secondly, if the communication is\u00a0overheard by a third party (Eve), it should be deniable from Eve. That is, not only should Eve should not\u00a0learn anything about the source\u2019s message, in fact Eve should not even be able to reliably decide whether\u00a0or not the source is indeed communicating to Bob. To be able to instantiate such deniability in\u00a0communication, there need to be asymmetries that might exist between Bob and Eve (for instance, perhaps\u00a0the noise on the channel to Eve is higher than the noise on the channel to Bob, or perhaps Eve observes\u00a0only a subset of the transmissions that Bob does).\u00a0<\/span><\/p>\n

The tools used are typically information-theoretic and\/or coding-theoretic in nature. Typically, deniability is\u00a0formally defined in terms of a hypothesis-testing metric, and then one demands that the communication\u00a0protocol that is reliable to Bob also have \u201chigh deniability\u201d, regardless of Eve\u2019s estimation strategy. Recently,\u00a0in various communication settings (wired, wireless and quantum channels\/networks), fundamental bounds\u00a0on optimal rates for deniable communication, and also complementary schemes that are close to optimal.\u00a0<\/span><\/p>\n

This talk will\u00a0be a survey of some of this recent work by a variety of groups (Jie Hou and Gerhard\u00a0Kramer; Boulat Bash, Dennis Goeckel, and Don Towsley; Matthieu Bloch; Ligong Wang, Greg Wornell and\u00a0Lizhong Zheng) and by myself and collaborators (Pak Hou Che, Mayank Bakshi, Swanand Kadhe, Alex\u00a0Sprintson).\u00a0<\/span><\/p>\n

Sidharth Jaggi:\u00a0<\/b>Research interests: Network coding and network error-correcting algorithms, coding theory, steganography, group testing,\u00a0compressive sensing. B.Tech. (\u201900), EE, IIT Bombay,\u00a0<\/span>MS\/Ph.D. (\u201905) EE, CalTech,\u00a0Postdoctoral Associate (\u201906) LIDS, MIT,\u00a0Currently Associate Professor, Dept. of Information Engineering, The Chinese University of Hong Kong.<\/p>\n

Faculty Host: Bobak Nazer<\/p>\n","protected":false},"excerpt":{"rendered":"

Wednesday, May\u00a025,\u00a02016, 3-4 pm 15 St. Mary\u2019s Street,\u00a0Room 105 Refreshments at\u00a02:45 pm Sidharth Jaggi Chinese University, Hong Kong     Deniable\/Covert\/Stealthy\/LPD communication The urge to communicate, to speak and be heard, is a fundamental human need. However,\u00a0embedded within our increasingly sophisticated communication networks, Big Brother is often watching.\u00a0There are situations where even the fact that […]<\/p>\n","protected":false},"author":18605,"featured_media":0,"parent":32415,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/pages\/31472"}],"collection":[{"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/users\/18605"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/comments?post=31472"}],"version-history":[{"count":2,"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/pages\/31472\/revisions"}],"predecessor-version":[{"id":31523,"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/pages\/31472\/revisions\/31523"}],"up":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/pages\/32415"}],"wp:attachment":[{"href":"https:\/\/www.bu.edu\/cise\/wp-json\/wp\/v2\/media?parent=31472"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}