it contains 20 slides full of pics n related information about bittorrent,its implementation,vulnerabilities and remedies and importance in practical life..Moreover,the facilities for small software developers..

1. Presented by ABHISHEK ROY DEBASISH MUKHERJEE SUMAN HALDER BHANU PRATAP JHA

2. PROTOCOLS For data transfer over the network, protocols are used( to ensure interoperability) .Some of them are HTTP,FTP,SMTP etc..BitTorrent is also a kind of protocol..designed by Bram Cohen in 2001

4. P2P traffic is rising

5. Server Distributing a Large File d 1 F bits d 2 d 3 d 4 upload rate u s Download rates d i Internet

6. BitTorrent Approach

7. File transfer 1 2 3 4 5 6 7 8

8. Peers Help Distributing a Large File d 1 F bits d 2 d 3 d 4 upload rate u s Download rates d i Internet u 1 u 2 u 3 u 4 Upload rates u i {1,2,3,4,5} {1,2,3,4,5,6,7,8} {1,2,3,4} C1 C2 {1,2,3} {1,2} C3 C4 Clients c i

10. Error detection mechanism .torrent file contains hash which works as checksum.After downloading a file it is checked against the hash given within .torrent file,if mismatch occurs,then the downloaded file is corrupted ..

11. Chocking When a peer receives a request for a piece from another peer, it can refuse to transmit that piece. If this happens, the peer is said to be choked

12. BT: publishing a file Web Server Initial seeder Tracker Downloader: A Seeder: B Downloader: C Harry Potter.torrent

14. Operation

16. Bandwidth Shaping BitTorrent is usually used to transfer large sized files due to which the traffic over the ISPs increase to a large extent. To avoid such exploding traffic on their servers many ISPs have started to avoid the traffic caused by BitTorrent

18. DDOS Attack