1. An Introduction to Privacy and Anonymous Communication
PV Rajkumar
Research Scholar

2. Anonymous and privacy communication
Outline
Privacy and Traffic Analysis
Anonymous Communication
Onion Routing
Attacks Over Anonymity
Anonymous and privacy communication
11/19/2018

3. Privacy and Traffic Analysis
- Ability to protect information about himself
Traffic Analysis
- Intercepting and Examining messages
- Reveals identity of communicating systems
- Information about size and frequency of data transfer are Identified
Anonymous and privacy communication
11/19/2018

4. Anonymous and privacy communication
Potential Threats
IP Based Blocking
- Hide some portion of information based on IP. It may marketing research.
IP Based Cloaking
- Showing different content based on IP
Information Leakage
- Corporate Information
- Defense Information
Anonymous and privacy communication
11/19/2018

5. Anonymous Communication
Anonymity
Keeping the Identity of Communicating Parties Secret
Methods
Broadcast Based
Proxy or Series of Proxies
Mix-net
Anonymous and privacy communication
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6. Anonymous and privacy communication
Onion Routing
Basic Components
- Application proxy
- Onion proxy
- Logically connected distributed
Onion Routers (Onion Network)
- Entry point
- Exit point
Anonymous and privacy communication
11/19/2018

7. Anonymous and privacy communication
Onion Routing
Onion Network Construction
Onion Structure
Anonymous and privacy communication
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8. Anonymous and privacy communication
Onion Routing
Anonymous Connection Establishment
Generic Cell Format
Anonymous and privacy communication
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9. Anonymous and privacy communication
Onion Routing
Commands
-Padding
-Create
-Data
-Destroy
Configurations
-Firewall Configuration
-Remote Proxy Configuration
Anonymous and privacy communication
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10. Attacks Over Anonymity
Passive Attacks
-Listing and Analyzing the on going traffic
Active Attacks
-Sending Special Cell
- Marking
Anonymous and privacy communication
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11. Anonymous and privacy communication
References
Michael, Paul and David “Anonymous Connections and Onion Routing”, IEEE Journal on Selected Areas in Communication Volume 14, No.4, May 1998
Michael K. Reiter and Aviel D. Rubin “Anonymity for Web Transactions”, ACM Transactions on Information and System Security, volume 1, pages 66–92, 1998.
D Chaum. “The dining cryptographers problem: Unconditional sender and recipient untraceability.”
Journal of Cryptology, Volume 1 :65–75, 1988.
Anonymous and privacy communication
11/19/2018