Krunal Patel Department of Information Technology A.D.I.T. Engineering College (G.T.U.) India. Fig. 1 P2P Network

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1 Volume 3, Issue 7, July 2013 ISSN: X International Journal of Advanced Research in Computer Science and Software Engineering Research Paper Available online at: Secure Peer-to-Peer File Sharing Network Samip Patel Department of Information Technology B.V.M. Engineering College (G.T.U.) India Krunal Patel Department of Information Technology A.D.I.T. Engineering College (G.T.U.) India Abstract Peer-to-Peer network is a communication model in which each node works as both client and server. P2P networks can be used to share files, discussed forms and streaming media. It is popularly used as file swapping network to give distributed content sharing. In the absence of security, files would have not been shared securely among the different peers. Security will be provided by authentication, encryption and integrity. In this paper, we have shown how peer-to-peer file sharing network can be done secure. Keywords Peer-to-Peer, node, network, encryption, integrity Vikram Agrawal Department of Information Technology B.V.M. Engineering College (G.T.U.) India I. INTRODUCTION Peer-to-Peer network is a distributed computing architecture which enables individual peers to connect to and communicate directly with other peers. Rather than storing files at a central location to which individual peers must connect to access the files, P2P enables individual peers to share directly among themselves. Fig. 1 shows simple p2p network. Over the years, peer-to-peer file sharing networks have gone through many evolutionary changes. First generation p2p file sharing network built around centralized server. Users store the files, they wanted to share and run the Napster software. It connects their machine to Napster s central server and uploads a list of files for sharing considering each user s machine as a mini file server. When user fires a query, Napster will look for the file in central database and sends back list of all matched files. In this kind of network problem occurs if central server goes down. This problem resolves in second generation p2p network. It works same way as Napster in which users store files, they want to share but it uses decentralized structure and there is no central server to shut down. Third generation p2p file sharing network works in the same way as second generation but the difference is it also has anonymity features incorporated into them. It is eventually private network, which masks private network while user is connected, masking IP address and by encrypting all the data transmission. In fourth generation p2p file sharing network, Fig. 1 P2P Network Peer-to-peer file sharing network has several problems. Administration of the network seems difficult as network becomes decentralized. Also lack of security and no link in the network is reliable. P2P network opens a large number of parallel connections. Large amount of traffic and large number of connections may overload the server memory. No authentication is there while connection is being established. There is no way of checking login names to see whether user has permission to access the share. Moreover if user gets your local machine control, he or she would have full permission regardless of how user has logged in. There are three ways by which security can be provided in p2p network. First step is authentication which determines the identity of a communicating party. Second step is encryption which converts plaintext to cipher text. Third step is integrity that is assurance the information can only be accessed by authorized user. This paper is organized as follows: Section II gives the idea of related work. Section III presents implementation results and conclusion is presented in section IV. References are listed at the end of paper. 2013, IJARCSSE All Rights Reserved Page 778

2 II. RELATED WORK To provide a security in P2P network is main purpose of this work. Basic model of the system is as follows. Provide authentication when communicating with the server or with other peers. Use of secret key cryptography for secure communication. Use of hashing for file content integrity validation. Actions performed by both peers can be easily explained by following diagram. Below steps shows the use of authentication, secret key and hashing. Step 1:- Client gives the username and password and afterwards random number is generated. Use username and random no. to make the combination like username: Random No. Password is converted to Hash Key by MD5 algorithm and converted to its native form by base64. Password Hash Key Ex HQRPWQ (Password MD5 Base64) Using DES algorithm, the combination of username and password is converted in to encrypted string with the use of hash key. HQRPWQ (key) Ex. Samip: 80 POPGH (Encrypted String) Now client sends commands (Auth, List, Get, Query) to the server. Ex. Auth: Samip : POPGH 2013, IJARCSSE All Rights Reserved Page 779

3 (Username) (Encrypted String) Step-2: Server receives Auth command and finds the password of respective username from file. Once the password found then converted to Hash Key by MD5 algorithm and converted to its native form by base64. Password Hash Key Ex HQRPWQ (Password MD5 Base64) Using DES algorithm, decrypt that string with the use of Hash Key. HQRPWQ (key) Ex. POPGH (Encrypted String) Samip: 80 Now compare the string samip and username which is sent by client. Increment the random no. by 1. To generate the session key, we have to generate the incremented random no. E.g. key = + random no. Now convert the random number into hash key. Using DES algorithm, the combination of session key and random no. is converted in to encrypted string with the use of Hash Key generated above. HQRPWQ (key) Ex. Session Key: 81 XYZABC (Encrypted String) The above encrypted string is sent to client. Step-3: Client receives that XYZABC (Encrypted String) from the server Using DES algorithm, decrypt the encrypted string (XYZABC) and converted into the combination of Session Key and Random No. with the use of Hash Key generated. HQRPWQ (key) Ex. XYZABC (Encrypted String) Session Key: 81 Do 81 1 = 80 and compare it with own random no. Use this session key for client-server communication Step-4: Let s assume samip is a client. Create a folder titled as samip and keep all the files inside that folder. Client sends LIST command to server. Ex. List: 1.txt:2.txt:1.jpg Now encrypt above string shown in example using session key (XYZABC) & send to server. Step-5: Client B will use the Query command if it wants any file from the server. Client B sends Query command to server. Ex. Query: Filename Now encrypted it using session key & then send to server. Step-6: Server Decrypt it. Take the filename which the client wants and finds it. Take the IP address of client and generate the peer to peer key, ticket and find how much time the ticket is valid. Server encrypts the peer to peer key and ticket. Use session key of client and send it to client B. Step-7: Generate PP (peer-to-peer) key by doing random no. md5 base 64. Generate Ticket: which includes username (which has file), pp key and Time and encrypt it. If client wants to gets the file then use following command. GET: File name :IP address: pp key :Ticket Generate one random no. Using pp key, encrypt above random no. PP key Ex. Random no. Encrypted string [XYZNMO] Client B sends GET:File Name: IP address:pp key :Ticket: XYZNMO to client A. Step-8 Client A receives, take Ticket & for decrypt, use own password. Client A gets username, pp key & Time. Using the time, it just checks that whether the ticket is valid or not. If ticket is valid then PP key E.g. Random No. find the Random No. 2013, IJARCSSE All Rights Reserved Page 780

4 III. RESULTS Fig. 2 Result of steps 1, 2, 3, 4 shown above at client side Fig. 3 Result of steps 1, 2, 3, 4 shown above at server side Fig. 4 Result of steps 5 & , IJARCSSE All Rights Reserved Page 781

5 Fig. 5 Result of step 7 Fig. 6 Result of step 8 IV. CONCLUSIONS Results shown above show that in case of authentication, peer sends the ticket which it gets from server to give it to other peer. DES algorithm is used for the encryption purpose. MD5 algorithm is used for the integrity purpose. Use of authentication and integrity features make peer-to-peer file sharing concepts secure and reliable. REFERENCES [1] S. Lui, K. Lang, and S. Kwok, "Participation Incentive Mechanisms in Peer-to-Peer Subscription Systems," presented at 35th Annual Hawaii International Conference on System Sciences (HICSS'02), Big Island, Hawaii, [2] Bellovin, S.: Security aspects of Napster and Gnutella. In: 2001 Usenix Annual Technical Conference, Boston. 2013, IJARCSSE All Rights Reserved Page 782

6 [3] Liang, J. R. Kumar, Y. Xi, and K. Ross. Pollution in p2p file sharing systems. In IEEE Infocom, Miami, FL, USA. [4] P. Maymounkov and D. Mazi`eres, Kademlia: A peer-topeer information system based on the XOR metric, in 1 st International Workshop on Peer-to-Peer Systems, pp , March [5] A. Rowstron and P. Druschel, "Storage management and caching in PAST, a large-scale, persistent peer-to-peer storage utility," presented at 18th ACM SOSP'01, Lake Louise, Alberta, Canada, [6] B. den Boer and A. Bosselaers. Collisions for the compressionfunction of MD5. In Advances in Cryptology Eurocrypt, pages , Springer-Verlag. [7] I. Stoica, R. Morris, D. Karger, M. F. Kaashoek, and H. Balakrishnan, Chord: A scalable peer-to-peer lookup service for Internet applications, in ACM SIGCOMM 2001, pp , August , IJARCSSE All Rights Reserved Page 783

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