The current state of anonymous file-sharing - Marc's Blog

More documents

Recommendations

Info

Figure 3: ipoque internet study 2007: total protocol distribution Germany Figure 4: ipoque internet study 2007: p2p protocol distribution Germany 4.2 Bittorrent The Bittorrent "network" isn’t a network in the classical sense. Not every node downloading something in Bittorrent is on the same logical network. As in Bluetooth, there are scatternets being built for every file or group of files being shared. When talking 11
about a "network" in context with Bittorrent, it relates to the "network" that is being built for a specific torrent file. The protocol has no built-in search possibilities or other bells and whistles, it is a pretty slim protocol and there are 2 or 3 different types of nodes involved in a file transfer on the bittorrent network depending on the way the network is used. 4.2.1 Roles in a Bittorrent network In a bittorrent network, you can find 3 different roles that clients can take: • a "seeder": the node serving the file to the network • a "leecher": a node downloading the file from the network And usually there also is: • a "tracker": A place where all the information about the participants of the network come together. The tracker is a node serving meta-information about the torrent file. According to the current protocol specs, a tracker can be replaced by a distributed hashtable which is being distributed throughout the users of the different scatternets, given that the clients on the network support it. The major Bittorrent applications and libraries all support the so called ”mainline DHT”. 4.2.2 Creating a network A file (or a group of files) that is being distributed to the bittorrent network first has to undergo a process to create a matching ".torrent" file. The file(s) is/are being cut into chunks of 128 kb size and those chunks are being hashed using the SHA1 algorithm. The information about the name of the file(s), the amount of chunks, the chunks respective position in the original file(s) and the hash of each chunk is being saved in the torrent file. After the meta-information about the files has been added, an "announce URL" is being embedded in the torrent file. The announce URL contains the IP/DNS of the tracker and a hash identifying the torrent file itself. Usually, the resulting file is being transfered to (and therefor: registered by) the tracker. The seeder now uses a Bittorrent-client to announce to the tracker that it has 100% of the file and can be reached using its IP address 12
Page 1 and 2: The current state of anonymous file
Page 3 and 4: Declaration of originality I hereby
Page 5 and 6: 5.2 The Brightnet pattern . . . . .
Page 7 and 8: 2 Basic concept of anonymity in fil
Page 9 and 10: "MAC flapping" and make proper comm
Page 11 and 12: Physical Link Layer: Anonymity in t
Page 13 and 14: in email attachments until today).
Page 15: • structured search and content d
Page 19 and 20: 4.2.4 Superseeding Figure 5: schema
Page 21 and 22: ed2k://|file||||/ a real-world exam
Page 23 and 24: ased on the property of societies,
Page 25 and 26: cliques. A little example would be,
Page 27 and 28: 3. An ultrapeer connected down to o
Page 29 and 30: This step is being called the "prob
Page 31 and 32: To keep the ISP from detecting this
Page 33 and 34: and the amount of traffic generated
Page 35 and 36: This might help to solve the proble
Page 37 and 38: it, has either no specific meaning
Page 39 and 40: This means that the packets being s
Page 41 and 42: 2. Die Übermittlung von Informatio
Page 43 and 44: 2. Der Versuch ist strafbar Another
Page 45 and 46: Figure 10: End to End encryption is
Page 47 and 48: identifies itself to other nodes se
Page 49 and 50: This will tell the client the follo
Page 51 and 52: passed out to trusted nodes (you ca
Page 53 and 54: and thus subject to legal attack, O
Page 55 and 56: The application was designed to be
Page 57 and 58: • The fact that the client used t
Page 59 and 60: filtered by their networking equipm
Page 61 and 62: 7.2.4 Active Logging: Surrounding a
Page 63 and 64: References [1] Arvin Nayaranan and
Page 65: http://www.medialab.tfe.umu.se/publ

The current state of anonymous file-sharing - Marc's Blog

Create successful ePaper yourself

Delete template?

Save as template?