This presentation will lead you learn the basic working of onion routing in a fun way

2. IMPORTANT BENEFIT OF ONION

3. ONION AND COMPUTERS
 PROVIDES FREEDOM TO USERS OF COMPUTER

4. ANONYMITY ↔ GOSSIPS

5. WHY ANONYMITY IS PRACTICED IN
NETWORKS ?
 Privacy
 Intelligence sectors
 Data Security

6. Anonymous Communication Protocols
 Mix Networks (1981)
 Dining cryptographers (1988)
 Onion routing (1999)
 Anonymous buses (2002)
 Crowds (1998)
 PipeNet (1998)
 Xor-trees (2000)
4
 Hordes (2002)
 Salsa (2006)
 ISDN,pool,
Stop-and-Go,
timed,cascade
mixes
 etc.

7. HOW ONION ROUTING WORKS ?
 CORE IDEA: MIX NETWORKS
ONION ROUTING PHASES:
 Setup
 Transmission
 Teardown
ONION ROUTING HIDES SENDING HOST AND THE RECEIVING HOST
THIS IS ANONYMITY !!!

8. SETUP PHASE
1. CREATE from U /CREATED (ACK from 1)
2. EXTEND/EXTENDED
3. [Repeat with layer of encryption]
[l2,CREATED]
u 1 2 3
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9. TRANSMISSION PHASE
 Exchanging messages in the path setup during the setup phase

10. TEARDOWN PHASE
 After the successful delivery of message, the setup path will be destroyed.
 FOR EACH BLOCK OF MESSAGE, A NEW CIRCUIT IS FORMED BETWEEN THE
SOURCE AND THE DESTINATION.

11. How Onion Routing Works
User u running client Internet destination d
Routers running servers
u d
1 2
3
4
5
9

12. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
1 2
3
4
5
9

13. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
1 2
3
4
5
9

14. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
1 2
3
4
5
9

15. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
1 2
3
4
5
9

16. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{{{m}3}4}1
1 2
3
4
5
9

17. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{{m}3}4
1 2
3
4
5
9

18. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{m}3
1 2
3
4
5
9

19. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
m
1 2
3
4
5
9

20. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
m’
1 2
3
4
5
9

21. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{m’}3
1 2
3
4
5
9

22. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{{m’}3}4
1 2
3
4
5
9

23. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged
{{{m’}3}4}1
1 2
3
4
5
9

24. How Onion Routing Works
u d
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged.
4. Stream is closed.
1 2
3
4
5
9

25. How Onion Routing Works
u
1. u creates l-hop circuit through routers
2. u opens a stream in the circuit to d
3. Data are exchanged.
4. Stream is closed.
5. Circuit is changed every few minutes.
1 2
3
4
5
d
9

26. THANK YOU
For more information visit my blog pingtheprotocols.blogspot.com