bc. oldřich faldík bc. tomáš pavlacký bc. ondřej matulík 24. 3 . 2014
DESCRIPTION
Bc. Oldřich Faldík Bc. Tomáš Pavlacký Bc. Ondřej Matulík 24. 3 . 2014. Tor – anonymity online . Tor. O pen source proje ct Tails Orbot Tor Browser Provides anonymity Used by dissidents in non-democratic countries, military agents, activists, whistleblowers. The Tor network . - PowerPoint PPT PresentationTRANSCRIPT
Bc. Oldřich FaldíkBc. Tomáš PavlackýBc. Ondřej Matulík
24. 3. 2014
Tor – anonymity online
• Open source project• Tails• Orbot• Tor Browser
• Provides anonymity• Used by dissidents in non-democratic
countries, military agents, activists, whistleblowers
Tor
The Tor network
• Several thousand nodes• 4500 nodes• Two types of nodes
• Exit nodes• Non-exit nodes
STEPS:1. identify sender and recipient2. get list of available nodes3. create a circuit to recipient4. determine exit node to interconnects Tor network
and external internet domains
Principles of route formation
MESSAGE
Data Encryption
MESSAGE
Data Encryption
MESSAGE
Data Encryption
MESSAGE
Data Encryption
MESSAGE
Data Encryption
Encryption Methods
• Communication node – node and client – node: • TLS (Transport Layer Security)
• Neighbour routers in chain (data path):• AES-128-CTR (AES with a 128 bit key in
counter mode)
Pros x cons
• Pros:• completely free• encrypts all traffic
• Cons:• configuration is not trivial• perfomance is unpredictable• not suitable for p2p applications
Thank you for your time