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conger-TAP - Traffic Analysis Prevention Chris Conger...

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Traffic Analysis Prevention Chris Conger CIS6935 – Cryptographic Protocols 11/16/2004
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Outline What is Traffic Analysis Prevention (TAP)? Problems, challenges with TAP Analysis attacks, typical system vulnerabilities Methods of TAP Case Study: NetCamo Conclusion
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Introduction to TAP Traffic Analysis Prevention – Traffic Analysis - an adversary who monitors or compromises parts of a system, in order to match message senders with recipients [FRAN00] Network Unobservability - Masking comm. patterns which emerge over time Achieving network unobservability implies ineffective traffic analysis
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Challenges for TAP Loss of efficiency/performance from adding TAP mechanisms to a system Number of possible senders/recipients bounded
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Analysis Attacks, cont… Brute-force Following every possible path a message might have taken Typically results in a list of possible sender/recipient pairs Node flushing A mix node** which sends out messages after receiving N messages; Attacker sends N-1 messages to a node, can then match his inputs with messages leaving the node
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