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That size-inference side channel leak has been patched for years, random padding is added between hops to mitigate this.

It is large files / DDoS going over the network that is still hard to obfuscate.

Which is why TOR is intentionally slow, especially when requesting larger files. If it wasn't, you could watch the lump of data traverse across the pipe.

source: n/a

source: padding spec, https://gitweb.torproject.org/torspec.git/tree/padding-spec....

Thank you. My brain is very damp but knew it was somewhere.

That's why Tor is communicating mostly over fixed-size cells with a fixed size of 514 bytes (or 512 if tor version < 4).

There is also random padding added to cells, so that the cell content is unpredictable.

BRB, padding all of my webpages to be exactly 650mb each.

npm install electron react-native-web