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BitTorrent v2 (2020)

blog.libtorrent.org

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Re: BitTorrent v2 (2020)

#141

Post by marcan_42 »

newby wrote: post #94
marcan_42 wrote: post #17

Earlier quoted context omitted.

That's not a given. As far as I know, there is no proof of the security or lack thereof of this kind of function. Increases in computing power alone can't render SHA256 insecure; that can be proven by thermodynamic/size-of-the-universe arguments. You need an actual cryptographic weakness.

> Increases in computing power alone can't render SHA256 insecure; that can be proven by thermodynamic/size-of-the-universe arguments. Fascinating. Could you please recommend a source where a curious layman could learn more about this?

I posted a link and some further analysis in this comment: https://news.ycombinator.com/item?id=29883965

Re: BitTorrent v2 (2020)

#142

Post by Thorentis »

moolcool wrote: post #43

BitTorrent slaps so hard as a protocol, and DHTs are absolutely brilliant. With all of the recent hype about decentralization with the rise of crypto, I'm surprised BitTorrent hasn't seen much hype or revitalization as well.

Because there's no built in coins, NFTs, or tokens that investors can pump and dump. In other words, it's an actually useful tool.

Re: BitTorrent v2 (2020)

#143

Post by brokenmachine »

SethTro wrote: post #108
gkfasdfasdf wrote: post #92

The per file hash to assist in deduplication is pretty neat. Wonder if it could be taken a step further by chunking files into blocks based on a rolling hash, so that it can dedup portions of a file as well (a la lbfs https://pdos.csail.mit.edu/archive/lbfs/ ). Or does anyone know if it already does that?

It is highly unlikely that the duplicate portions of the file will have an offset that's a multiple of 2^16 which would be required for chunks to have matching hashes. On the client side you could theoretically run lbfs over your files but on the swarm side this isn't going to happen

Rabin fingerprinting can do this I believe.

"the idea is to select blocks not based on a specific offset but rather by some property of the block contents"

https://en.wikipedia.org/wiki/Rabin_fingerprint#Applications

Re: BitTorrent v2 (2020)

#144

Post by _hypx »

moolcool wrote: post #43

BitTorrent slaps so hard as a protocol, and DHTs are absolutely brilliant. With all of the recent hype about decentralization with the rise of crypto, I'm surprised BitTorrent hasn't seen much hype or revitalization as well.

Web3 or whatever should've been based around the concepts present in BitTorrent, not crypto.

Re: BitTorrent v2 (2020)

#145

Post by hiptobecubic »

wombat-man wrote: post #59
moolcool wrote: post #43

BitTorrent slaps so hard as a protocol, and DHTs are absolutely brilliant. With all of the recent hype about decentralization with the rise of crypto, I'm surprised BitTorrent hasn't seen much hype or revitalization as well.

This is part of why I'm a bit cynical about "web 3" in general. Bittorrent is terrific and yet the real money is streaming video/music platforms.

Bittorrent is basically revenue-hostile, so I don't expect it to get any more popular among content providers.

Re: BitTorrent v2 (2020)

#146

Post by ikt »

cuteboy19 wrote: post #10
ikt wrote: post #4

Earlier quoted context omitted.

i do love that it immediately goes into yet another crypto bashing comment chain while not realising that a crypto company owns bittorrent: https://torrentfreak.com/bittorrent-inc-confirms-acquisition... and that after the creator of bittorrent left he created his own cryptocurrency: https://en.m.wikipedia.org/wiki/Chia_(cryptocurrency)

Reading through the wikipedia page for Chia > The Chia Network was founded in 2017 by American computer programmer Bram Cohen, the author of the BitTorrent protocol.[4] In China stockpiling ahead of the May 2021 launch led to shortages and an increase in the price of hard disk drives (HDD) and solid-state drives (SSD).[5] Shortages were also reported in Vietnam.[6] Phison, a Taiwanese electronics manufacturing compan…

> Thankfully the coin seems to have collapsed completely since May 2021

That doesn't appear to be the case:

https://www.coingecko.com/en/coins/chia

Currently rank #257 with a market cap of $247 million.

The whole altcoin market has been in limbo/declining since May last year.

Last update was also yesterday: https://www.chia.net/2022/01/10/understanding-the-changes-in...

Re: BitTorrent v2 (2020)

#147

Post by xfer »

makeworld wrote: post #75
moolcool wrote: post #43

BitTorrent slaps so hard as a protocol, and DHTs are absolutely brilliant. With all of the recent hype about decentralization with the rise of crypto, I'm surprised BitTorrent hasn't seen much hype or revitalization as well.

I'm not surprised. BitTorrent just works, and doesn't provide any opportunity to separate people from their money.

There is a whole scene around people spending 50-100/m just around this. There is a lot of money to be made if you live in the "right" countries.

Re: BitTorrent v2 (2020)

#148

Post by devwastaken »

nodja wrote: post #6

I assume this is being posted because qBittorrent recently released version 4.4 which includes libtorrent 2.x and therefore support for BitTorrent v2. Hopefully we'll start seeing hybrid torrents/magnets in trackers soon. Although these are mostly automated so I'm not sure how fast the tools will catchup. One thing I'd like qBittorrent and other torrent clients to do is to allow users to upgrade v1 torrents to hybrid…

I'd like qbittorrent to work, personally. Worked for 1 torrent, and now won't even contact trackers, just stalls. Installed deluge beta and works perfectly.

Re: BitTorrent v2 (2020)

#149

Post by GoblinSlayer »

marcan_42 wrote: post #134
dooglius wrote: post #36

Earlier quoted context omitted.

Do you have a cite for this for SHA256? It surprises me a bit as our galaxy is big and we are far from physically ideal computers.

I did the math myself at one point, but I lost the link. However, here's a reference for the same kind of thing: https://pthree.org/2016/06/19/the-physics-of-brute-force/ The total energy output of a supernova is enough to count up to 2^220, making a lot of generous (invalid) assumptions. You'd need 2^36 supernovas to just count up to 2^256, never mind actually running SHA256. At minimum. There are circa 2^38 stars i…

A supernova may be an inefficient source of energy, it's probably better to take that material and make dwarf stars from it.

Re: BitTorrent v2 (2020)

#150

Post by GoblinSlayer »

EVa5I7bHFq9mnYK wrote: post #82
Stevvo wrote: post #58

Earlier quoted context omitted.

SHA1 collision was never much of a reason to change it in the first place; there is no practical attack that arises from it.

1) Take a popular game torrent 2) add crypto mining code 3) pad it so the SHA1 stays the same 4) seed it, the magnet links will pick up your version 5) profit!

That's a preimage attack. For example, the entire bitcoin network today needs something on the order of a trillion years for a preimage attack on MD5, multiply by another trillion for a SHA1 preimage attack.
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