Lecture7 MIX_NETWORKS

Lecture7 MIX_NETWORKS - Privacy and Anonymity Using Mix...

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11/18/09 1 Privacy and Anonymity Using Mix Networks* Nitesh Saxena CS392/6813 Some slides borrowed from Philippe Golle, Markus Jacobson
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11/18/09 2 Course Admin Midterm is being graded; solution will be posted soon HW4 solution will be posted HW4 will be graded after mid-term is graded HW5 will be posted soon
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11/18/09 3 AOL Search Query Log AOL's disturbing glimpse into users' lives, C 21 million search queries posed over a 3-month long period; 650,000 users No user identification information released per se, but?? Search Log still available: http://www.gregsadetsky.com/aol-data/
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11/18/09 4 Outline Mix Network (Mixnet) Mixnet Applications Mixnet Requirements Robustness of Mixnets Types of Mixnets Decryption based (Onion Routing) Re-encryption based
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11/18/09 5 Definition: Mix Server (or Relay) A mix server: Receives inputs Produces “related” outputs The relationship between inputs and outputs is secret Inputs Outputs ? Mix Server
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11/18/09 6 Definition: Mix Network Mix network A group of mix servers that operate sequentially. Server 1 Server 2 Server 3 Inputs Outputs ? ? ?
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11/18/09 7 Applications Hide: “who voted for whom?” “who paid whom?” “who communicated with whom?” “what is the source of a message?” Good for protecting privacy for election and communication Used as a privacy building block
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11/18/09 8 1. “Who do you like best?” 1. Put your ballot into a WHITE envelope and put again in a RED one and sign on it Electronic Voting Demonstration Jerry Washington Lincoln Roosevelt
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9 Administrators will 1. Verify signatures together 2. 1 st Admin. shuffles and opens RED envelopes 3.
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Lecture7 MIX_NETWORKS - Privacy and Anonymity Using Mix...

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