Only if the hash matches, meaning that the chunk contains exactly the same bytes as the expected chunk, is it accepted. As the file chunks are then downloaded by the client, they are first hashed by the client itself, and compared with the previously received hash. The hashes are given to each BitTorrent client prior to the download - usually contained in a. a checksum is generated, by the torrent creator. Each of those chunks is then hashed using SHA-1, i.e. (On a side note, correctly configured HTTPS, with S, prevents this.)Ī file that is transmitted via BitTorrent, on the other hand is first divided into chunks. You then request to download a certain file, but the attacker sends you a malicious file instead. Meaning, from your end it looks like you are connected to, but actually you are connected to a third party which is intercepting the traffic, manipulating the network traffic, and only making it look like you are connected to. ![]() If any of the HTTP mirrors have security vulnerabilities, or are not under the provider's control, an attacker could simply replace the file, and it would go undetected on the side of the recipient.įurthermore, if the circumstances allow, HTTP is susceptible to a Man-in-the-Middle attack. or actually downloading the file that you expected to receive.to verify that you are actually connected to the server that you intend to connect to,. ![]() The difference is that the BitTorrent protocol has a mechanism to verify that you received what you intended to receive, whereas HTTP does not.
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