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Some clients require Base32 of info_hash (e.g., Vuze). BitTorrent info hash v2 (BTMH) BitTorrent v2 replaces the obsolete SHA-1 hash with a SHA-256 info hash. The v2 info-hash is given a new prefix (btmh) to allow for torrents that can participate in both v1 and v2 swarms [8] xt=urn:btmh:[1220: (v2 prefix) BitTorrent Info Hash ] Message Digest ...
Hash checks greatly reduce the chance that invalid data is incorrectly identified as valid by the BitTorrent client, but it is still possible for invalid data to have the same hash value as the valid data and be treated as such. This is known as a hash collision. Torrent and p2p files typically use 160 bit hashes that are reasonably free from ...
Mainline DHT is the name given to the Kademlia-based distributed hash table (DHT) used by BitTorrent clients to find peers via the BitTorrent protocol. The idea of using a DHT for distributed tracking in BitTorrent was first implemented [1] [2] in Azureus 2.3.0.0 (now known as Vuze) in May 2005, from which it gained significant popularity.
Torrent files use the Bencode file format, and contain an "announce" section, which specifies the URL of the tracker, and an "info" section, containing (suggested) names for the files, their lengths, the piece length used, and a SHA-1 hash code for each piece, all of which are used by clients to verify the integrity of the data they receive.
Contains key-value pairs. Keys are byte strings and must appear in lexicographical order. Each key is immediately followed by its value, which can be any bencoded type. Examples: An empty dictionary is encoded as de. A dictionary with keys "wiki" → "bencode" and "meaning" → 42 is encoded as d7:meaningi42e4:wiki7:bencodee.
BitTorrent is a proprietary adware [5] BitTorrent client developed by Bram Cohen and Rainberry, Inc. used for uploading and downloading files via the BitTorrent protocol. BitTorrent was the first client written for the protocol. It is often nicknamed Mainline by developers denoting its official origins.
The key exchange helps to minimize the risk of passive listeners, and the infohash helps avoid man-in-the-middle attacks. RC4 is chosen for its speed. RC4 is chosen for its speed. The first kibibyte (1024 bytes) of the output is discarded to prevent the Fluhrer, Mantin and Shamir attack .
The particular hash algorithm used is often indicated by the file extension of the checksum file. The ".sha1" file extension indicates a checksum file containing 160-bit SHA-1 hashes in sha1sum format. The ".md5" file extension, or a file named "MD5SUMS", indicates a checksum file containing 128-bit MD5 hashes in md5sum format.