Understanding Tor Onion Services and Their Use Cases

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Properties • Self authenticated • End-to-End encrypted • Isolation <strong>and</strong> NAT punching • Minimized surface attack ● HSAuth / stealth mode ● Unix Sockets • Censorship resistance - No DNS or BGP hijacking/poisoning/etc BS
Stealth Mode $ vi /etc/tor/torrc HiddenServiceDir /var/lib/tor/hidden_service/ # Authorized users only HiddenServiceAuthorizeClient stealth user1,user2,user3 $ cat /var/lib/tor/hidden_service/hostname ujd82kjkjusj3i88.onion oiujadsfuDIUankjnaei/R # client: user1 kkioajdyuje99zja.onion 87ajdiuta6dHDYTJAkz7/x # client: user2 98kjjaokkeoahzu1.onion uAuasdoi18DBfoRjsayu/x # client: user3
Page 1 and 2: Understanding Tor Onion Services an
Page 3 and 4: Encrypted Link Unencrypted Link Ali
Page 5 and 6: History of Onion Service Changes in
Page 7 and 8: How much onion traffic?
Page 9: Properties and Use cases
Page 13 and 14: Keeping your (vulnerable) infra sec
Page 15 and 16: Onion Service: Step 1 IP1-3 Tor Cir
Page 17 and 18: Onion Service: Step 3 Step 3: Alice
Page 19 and 20: Onion Service: Step 5 Step 5: Servi
Page 21 and 22: Directory desc_id = H(onion-address
Page 23 and 24: Directory (3) desc_id rep1 HSDir n
Page 25 and 26: Weak Cryptography ● RSA 1024 ●
Page 27 and 28: HSDir Camping Attack Relays: desc_i
Page 29 and 30: HSDir Deanonymization Attack 13:37:
Page 31 and 32: HSDir Deanonymization Attack Circui
Page 33 and 34: Guard Discovery Attack (1/2) Attack
Page 35 and 36: The Next Generation Onion Service
Page 37 and 38: Directory Predictability desc_id =
Page 39 and 40: New Address Size From 16 characters
Page 41 and 42: Vanguard proposal No intersection b
Page 43 and 44: Single Onion Services Service side
Page 45 and 46: Development of Next Gen Onion Servi
Page 47 and 48: How to keep your onions healthy ●
Page 49: Thank you!

Understanding Tor Onion Services and Their Use Cases

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