PPT-Sybil Attacks and Reputation Tracking

Ken Birman Cornell University CS5410 Fall 2008 Background for today Consider a system like Astrolabe Node p announces Ive computed the aggregates for the set of leaf nodes to which I belong. Abbey. 1. Downton. Abbey is a fictional story set in England about an aristocratic English family and the servants who live and work in their home.. 2. The time period in which the story takes place is 1912 to 1919. They call this time in English history . Birling. Character Study. Sybil. The Roman / Greek prophetess….. Who can’t see. Key points about character. Even more hard-faced and arrogant than her husband.. Introduced as her husband's . ‘social superior’. By John R. Douceur. Presented by Samuel Petreski. March 31, 2009. Terminology. Background. Motivation for Sybil Attack. Formal Model. Lemmas. Conclusion. Resources. Outline. Entity. An entity is . a collection . By John R. Douceur. Presented by Samuel Petreski. March 31, 2009. Terminology. Background. Motivation for Sybil Attack. Formal Model. Lemmas. Conclusion. Resources. Outline. Entity. An entity is . a collection . (RIGHT,DUTIES AND VALUE OF WOMEN IN VICTORIAN BRITAIN). The idea of femininity in the Victorian era was encapsulated in the idea of the 'woman's mission', but this passive role could not be tolerated for long. Women soon began to seek a more independent life. Gang Wang, . Bolun Wang. , . Tianyi. Wang, Ana . Nika. , . Haitao Zheng, Ben Y. Zhao. UC Santa Barbara. bolunwang@cs.ucsb.edu. Mobile = Life. Mobile phones for content, payment, authentication. Mobile devices are . : Supporting Reputation-Based Trust Management for Cloud Services. Talal. H. Noor, . Quan. Z. Sheng, Lina Yao, . Schahram. . Dustdar. , Anne H.H. . Ngu. Outline. Introduction. The . CloudArmor. Framework. --. Lecture . 2 (cont’d): Manipulations of . reputation systems. Patrick . Loiseau. EURECOM. Fall 2012. References. Main: . N. . Nisam. , T. . Roughgarden. , E. . Tardos. and V. . Vazirani. (. Eds. Gang Wang, . Bolun Wang. , . Tianyi. Wang, Ana . Nika. , . Haitao Zheng, Ben Y. Zhao. UC Santa Barbara. bolunwang@cs.ucsb.edu. Mobile = Life. Mobile phones for content, payment, authentication. Mobile devices are . Match each character to their first name. … (6). Mr Birling (senior). Mrs Birling. Miss Birling. Mr Birling (junior). Mr Croft. Ms Smith. Gerald. Sybil. Eva. Arthur. Sheila. Eric. Match each character to their first name…. Friedman . Resnick. Sami. Trust Graphs. Let . t(. i. , j) > 0 . denote the feedback . i. reports about j. Let . G = (V, E, t) . where V is the set of agents, E the set of directed edges, and t is as before. in Social Computing Systems. Krishna P. Gummadi. Max Planck Institute for Software Systems. Social computing systems. Online systems that allow people to interact. Examples:. Social networking sites: . Gang Wang, . Bolun Wang. , . Tianyi. Wang, Ana . Nika. , . Haitao Zheng, Ben Y. Zhao. UC Santa Barbara. bolunwang@cs.ucsb.edu. Mobile = Life. Mobile phones for content, payment, authentication. Mobile devices are . 26underwhichamalicioususercancreatemultiplefakeOSNaccountsTheproblemIthasbeenreportedthat15millionfakeorcompromisedFacebookaccountswereonsaleduringFebruary20107FakeSybilOSNaccountscanbeusedforvariousp