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Bc. Oldřich Faldík Bc. Tomáš Pavlacký Bc. Ondřej Matulík 24. 3 . 2014

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 .

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Bc. Oldřich Faldík Bc. Tomáš Pavlacký Bc. Ondřej Matulík 24. 3 . 2014

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  1. Bc. Oldřich Faldík Bc. Tomáš Pavlacký Bc. Ondřej Matulík 24. 3. 2014 Tor – anonymity online

  2. Tor • Open source project • Tails • Orbot • Tor Browser • Provides anonymity • Used by dissidents in non-democratic countries, military agents, activists, whistleblowers

  3. The Tor network • Several thousand nodes • 4500 nodes • Two types of nodes • Exit nodes • Non-exit nodes

  4. Principles of route formation • STEPS: • 1. identifysender and recipient • 2. get list ofavailablenodes • 3. create a circuit to recipient • 4. determine exit node to interconnects Tor network and external internet domains

  5. DataEncryption MESSAGE

  6. DataEncryption MESSAGE

  7. DataEncryption MESSAGE

  8. DataEncryption MESSAGE

  9. DataEncryption MESSAGE

  10. EncryptionMethods • Communication node – node and client– node: • TLS (Transport LayerSecurity) • Neighbourrouters in chain (data path): • AES-128-CTR (AES with a 128 bit key in counter mode)

  11. Pros x cons • Pros: • completelyfree • encryptsalltraffic • Cons: • configurationis not trivial • perfomance is unpredictable • notsuitable for p2p applications

  12. Thank you for your time

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