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270 lines
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<title>Peer-to-Peer Large File Sharing (Torrents over VPN)</title>
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<a href="../index.html">Previous Page</a></br></br><p><img src="../../assets/img/user.png" width="50px" height="50px"> <ba>XMRonly - 2024 / 10 / 23</ba></p>
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<h1>Peer-to-Peer Large File Sharing (Torrents over VPN)</h1>
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<img src="0.png" style="width:250px">
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<p> </p>
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<h2><b>Introduction</b></h2>
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<p>
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<!-- (explain acronym P2P, introduce terms seeder/leecher) -->
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<!-- Ever since people started communicating online, (the need for transmitting files to one another quickly emerged) they quickly realized a need for transmitting files to one another. While many methods of sending files came to exist, scaling file sending to accomodate larger and larger files became a problem due to constraints on bandswidth, speed, and connection reliability. Maintaining the integrity of large files during long transmission times became challenging and from this problem, the technology of torrenting was born. At its core, torrenting simply involves taking a large file, breaking it into smaller chunks, transmitting those smaller chunks from one peer to another (hence P2P), and having the receiving peer reconstruct those smaller chunks into the original file. The advantages here are that this process can be interrupted, is decentralized, and leechers can simultaneously download from multiple seeders thus speeding up the process. Even though torrenting is decentralized, it is important to keep in mind that this process inherently relies on users' IP address for file transmission which is visible to anyone participating. As such we must take precautions using a VPN to mask this information. In this article, we will explore how, after binding a VPN to their torrent clients, Sam the Seeder can create a torrent file and share a file with Larry the Leecher. -->
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While many methods of sending files online exist, scaling file sending to accomodate larger and larger files can be a problem due to constraints on bandswidth, connection reliability and maintaining file integrity. To solve some of these issues, the technology of torrenting was born. At its core, torrenting simply involves taking a large file, breaking it into smaller chunks, transmitting those smaller chunks from one peer to another (hence P2P), and having the receiving party reconstruct those smaller chunks into the original file. The advantages here are that this process is decentralized, can be interrupted/resumed, and leechers can simultaneously download from multiple seeders thus speeding up the process. This process inherently relies on users' IP addresses for file transmission which are visible to anyone participating. As such, we must take precautions using a VPN to mask this information. In this article, we will explore how, after binding a VPN to their torrent clients, Sam the Seeder can privately share a large file with Larry the Leecher.
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<h2><b>Setup</b></h2> </br> </br>
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<p>
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It is presumed that both Sam and Larry have already purchased a subscription to a <a href=https://blog.nowhere.moe/opsec/vpn/index.html target=_blank>VPN</a>. To start, they will sign in to their VPN client, ensure kill switch is enabled in the Settings, connect to their VPN and verify their IP address.
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<img src="1.png" class="imgRz">
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</p>
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<p>
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Both Sam and Larry will install qBittorrent:
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<!-- Blocks: -->
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<!-- -start by downloading qBittorrent (commands) -->
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<!-- -bind VPN to torrent client -->
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<!-- -can test -->
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<!---->
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<!-- Sam creates torrent -->
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<!-- Shares it with Larry over SimpleX -->
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<!---->
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<!-- Larry adds to .torrent file, starts downloading -->
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<!-- Download complete -->
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<pre>
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<code class="nim">
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sudo apt install qbittorrent
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</code>
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</pre>
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</p>
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<p>
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Sam and Larry will open up qBittorrent and be greeted with a one-time pop-up.
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<img src="2.png" class="imgRz">
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</p>
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<p>
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Next, Sam and Larry need to bind their VPN to qBittorrent. Under Tools -> Preferences -> Advanced, there is an option to specify the network interface. Select tun0, then click OK. Note: this interface does not appear unless the VPN is connected.
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<img src="3.png" class="imgRz">
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</p>
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<p>
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With this step complete, all qBittorrent traffic is routed through the VPN. Should the VPN disconnect, all current downloads/uploads will stop without revealing Sam or Larry's true IP address due to the kill switch option previously enabled.
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</p>
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<p>
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Sam is now ready to share a file with Larry. He has a 10GB file of "linux ISOs" for which he will need to create a .torrent file. To help with this, Sam will use <a href=https://privtracker.com target=_blank>PrivTracker</a>, a private BitTorrent tracker, to announce his .torrent file. Sam generates a private announce URL on the PrivTracker website and copies it to his clipboard.
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<img src="4.png" class="imgRz">
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</p>
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<p>
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In qBittorrent, Sam will go to Tools -> Torrent Creator. He selects the desired file, checks the box to make it a private torrent, clicks the box to start seeding immediately, pastes the previous copied announce URL in the Trackers URLs section and clicks on Create Torrent. Once the process finishes, he clicks OK.
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<img src="5.png" class="imgRz">
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</p>
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<p>
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Sam's qBittorrent client now shows he is now seeding the his 10GB file. Sam leaves his qBittorrent client running in order to be connectable and to seed the file to anyone connecting.
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<img src="6.png" class="imgRz">
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</p>
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<p>
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Sam now starts a <a href=https://blog.nowhere.moe/opsec/anonsimplex/index.html target=_blank>SimpleX</a> chat with Larry using disappearing messages and sends the newly created .torrent file.
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<img src="7.png" class="imgRz">
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</p>
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<p>
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Larry adds the .torrent file to his qBittorrent client to begin downloading the 10GB file. Under File -> Add Torrent File, Larry selects the .torrent file he received and clicks Open. Larry chooses where to save the 10GB file then clicks OK.
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<img src="8.png" class="imgRz">
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</p>
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<h2><b>Conclusion</b></h2> </br> </br>
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<p>
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Larry is now leeching the file that Sam is seeding! After a bit of time the transfer will be complete. Additionally, when inspecting the connecting peers, Larry is only able to see Sam's VPN IP address and vice versa.
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<img src="9.png" class="imgRz">
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</p>
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<h4>Nihilism</h4>
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Until there is Nothing left.</p></br></br><p>Creative Commons Zero: No Rights Reserved</br><img src="\CC0.png">
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<h4>My Links</h4>
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<a target="_blank" rel="noopener noreferrer" href="http://blog.nowhere.moe/rss/feed.xml">RSS Feed</a><br/><a target="_blank" rel="noopener noreferrer" href="https://simplex.chat/contact#/?v=2-7&smp=smp%3A%2F%2FL5jrGV2L_Bb20Oj0aE4Gn-m5AHet9XdpYDotiqpcpGc%3D%40nowhere.moe%2FH4g7zPbitSLV5tDQ51Yz-R6RgOkMEeCc%23%2F%3Fv%3D1-3%26dh%3DMCowBQYDK2VuAyEAkts5T5AMxHGrZCCg12aeKxWcpXaxbB_XqjrXmcFYlDQ%253D&data=%7B%22type%22%3A%22group%22%2C%22groupLinkId%22%3A%22c3Y-iDaoDCFm6RhptSDOaw%3D%3D%22%7D">SimpleX Chat</a><br/>
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<h4 class="readable">About nihilist</h4>
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