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
Re:The FBI Identified a Tor User
by HackerNCoder on Tuesday January 17, 2023 @02:00PM
(#34417028)
source: padding spec, https://gitweb.torproject.org/torspec.git/tree/padding-spec....
Thank you. My brain is very damp but knew it was somewhere.
Re:The FBI Identified a Tor User
by Scoundreller on Tuesday January 17, 2023 @09:52AM
(#34413043)
BRB, padding all of my webpages to be exactly 650mb each.
Re:The FBI Identified a Tor User
by UI_at_80x24 on Tuesday January 17, 2023 @10:53AM
(#34413998)
That way to can copy it to CD too!
Re:The FBI Identified a Tor User
by kylehotchkiss on Wednesday January 18, 2023 @01:11AM
(#34423904)
npm install electron react-native-web
Re:The FBI Identified a Tor User
by Run_DOS_Run on Tuesday January 17, 2023 @10:57AM
(#34414062)
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.
Not necessarily.
If a passive snooper knows I used Tor Browser to make an SSL request to en.wikipedia.org and received 987,654 bytes then immediately made a SSL request to upload.wikimedia.org and received 1,234,567 bytes that might be enough information to work out I visited https://en.wikipedia.org/wiki/National_Security_Agency.