If you're technically minded, you can also use the info hash to bypass centralized torrent trackers and communicate directly with peers via a Distributed Hash Table (DHT). Provides evidence if someone has tampered with the data. Verifies you're downloading the right data. Once the torrent hash has been made, it provides some key benefits for end-users: The hash is created by gathering specific information-such as file size, path, name, piece length, piece hashes, and privacy flags, then running it through a mathematical algorithm. SHA-1 hashes are 40 digits long (though you will also come across types of info hashes that are 32 or 64 digits). It is identical for all users and across all trackers.Īn info hash uses an SHA-1 cryptographic hash. It is best thought of as a unique ID for the torrent you are downloading. Otherwise, how does your torrent client know which bits to download from the P2P network? The downloaded parts arrive in small chunks from dozens of different users, then your computer pieces them back together again to make a single, usable file.īecause the file your downloading is so fragmented, there needs to be a reliable way to verify the contents. It is a centralized file-sharing network that requires users to connect to a server to gain access to the network. The ED2K network has been around since 2000 and is still in use today. They do not require a central server in order to be operational.īehind the scenes, you are simultaneously uploading and downloading a file. In this guide, we discuss how to connect to and use the eDonkey2000 (ED2K) and Kademlia (Kad) networks using the file-sharing program eMule. Unlike regular web traffic (which connects to a central server to download a file or webpage), torrent downloads are decentralized via a peer-to-peer (P2P) network. To explain what an info hash is, we first need to take a step back and look at how torrents work.
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