Doug Vitale Tech Blog

Posts Tagged ‘file sharing

Increase online privacy with RetroShare

In a previous article I described how to significantly increase your online privacy with the Tor service. RetroShare is another option for Internet users who are concerned with staying anonymous online. RetroShare is an application that lets you create private, secure network connections (based on 2048-bit RSA-encrypted SSL) with trusted individuals of your choice (a peer-to-peer network known as “Friend-2-Friend”, or F2F). Unlike some other P2P file sharing services like BitTorrent and Limewire/Frostwire which do not let you selectively share your files with certain users, RetroShare’s F2F functionality allows you to transfer files only with those users to whom you have given your explicit approval.

Once your computer establishes the decentralized F2F connection with your contacts, you can share files, send messages and chat, talk over VoIP, post and read messages in forums, etc. RetroShare not only fully encrypts all communications, it also provides reliable identification and authentication of your trusted contacts so you can be relatively sure that the other users participating in the F2F network are who they claim to be. RetroShare has the potential to be a completely independent social media venue where users’ private data and files are safe from advertisers, marketers, and other entities (i.e., Facebook, Google) looking to harvest personal information for profit, as well as entities engaging in surveillance and censorship. How safe is your online activity using RetroShare? As stated before, it uses SSL tunnels based on RSA 2048-bit encryption. To get an idea of how hard it would be to crack, this YouTube video should explain it.

Using RetroShare

Luckily, RetroShare is available for many different operating systems (Windows, Mac OSX, Linux, etc.). It is built on top of some very reputable and robust software libraries: GNU Privacy Guard/GPGME and OpenSSL.

After you download, install, and launch RetroShare you will first be prompted to create your RetroShare identity.

RetroShare create new identity

Then you will see the main graphical user interface (GUI) as shown below.

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Written by Doug Vitale

July 29, 2013 at 2:49 PM

BitTorrent: How it works and how to use it

BitTorrent is not an application you install; it is a network protocol that facilitates decentralized (or distributed) file sharing over the Internet. In this way it is similar to the functionality provided by traditional peer-to-peer (P2P) applications like Napster in the 1990’s, Kazaa, and Limewire. However, BitTorrent differs fundamentally from these older P2P sharing applications because it introduces components such as BitTorrent websites, torrents, trackers, seeders, and leeches (definitions below).

BitTorrent is also unique in how it efficiently uses bandwidth to achieve high data transfer rates. If the file you want is available from multiple hosts, BitTorrent establishes connections with them and downloads chunks of the file simultaneously. Therefore you trade one large, multimegabyte or multigigabyte download for several individual downloads, each of which is handling a much smaller sized data transfer. Additionally BitTorrent allows you to share these parts of a file even if the file itself isn’t fully downloaded on your end.
Typical BitTorrent network with data flow paths shown

Image source: Threestory Studio

Going further, the BitTorrent protocol is designed to ensure that its users share (upload) as much as they take (download). This feature is known as tit-for-tat and is meant to prevent users from downloading without uploading. In fact, BitTorrent tries to reward its generous users like so: the more files you share with others, the faster your downloads are. Obviously the number of users sharing the file you want will also play a role in determining download speed.

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Written by Doug Vitale

February 1, 2012 at 4:20 PM

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