libtorrent
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Support for BEP52 (BitTorrent v2)
Support the 'new' (originally proposed in 2008) BitTorrent v2 as described in BEP 52 [1].
libtorrent just gained support for it, see [2].
[1] https://www.bittorrent.org/beps/bep_0052.html [2] https://blog.libtorrent.org/2020/09/bittorrent-v2/
SHA-1 chosen-prefix attacks are now in the USD 10k-100k range. This presents a very real threat, for example against bittorrent-distributed software that might be used by dissidents or whistleblowers.
BitTorrent v2 should be high priority now.