Supercookie: Browser Fingerprinting via Favicon

Wouldn't the browser do a HEAD first? Seems like you could also use uniquely generated ETAGS as cookies if it does. Which would be more effective with favicons than the general case, given the comments about how browsers cache them.

Re: Supercookie: Browser Fingerprinting via Favicon

#5

Post by crashdelta » Sun, Feb 07, 2021, 2:19 AM UTC

It doesn't work in FireFox 85.0 x64 on Windows. I went to the site, did the demo, my number was A5 94 D6 7E 4A DE and when I came back in private mode it was 51 ED 26 D8 66 FC.

Re: Supercookie: Browser Fingerprinting via Favicon

#6

Post by luckyorlame » Sun, Feb 07, 2021, 2:25 AM UTC

hmm, thanks, I think. ....

Re: Supercookie: Browser Fingerprinting via Favicon

#7

Post by lordofgibbons » Sun, Feb 07, 2021, 2:26 AM UTC

crashdelta wrote: post #5

It doesn't work in FireFox 85.0 x64 on Windows. I went to the site, did the demo, my number was A5 94 D6 7E 4A DE and when I came back in private mode it was 51 ED 26 D8 66 FC.

Same on Firefox on linux. I got a fingerprint on one tab, and when that finished, I opened a new tab and ran the demo again - which gave me a new fingerprint ID.

Running privacy badger and ublock origin

Re: Supercookie: Browser Fingerprinting via Favicon

#8

Post by [deleted] » Sun, Feb 07, 2021, 2:31 AM UTC

[deleted]

Re: Supercookie: Browser Fingerprinting via Favicon

#9

Post by crashdelta » Sun, Feb 07, 2021, 2:33 AM UTC

lordofgibbons wrote: post #7

crashdelta wrote: post #5

It doesn't work in FireFox 85.0 x64 on Windows. I went to the site, did the demo, my number was A5 94 D6 7E 4A DE and when I came back in private mode it was 51 ED 26 D8 66 FC.

Same on Firefox on linux. I got a fingerprint on one tab, and when that finished, I opened a new tab and ran the demo again - which gave me a new fingerprint ID. Running privacy badger and ublock origin

That's it, I'm running Privacy Badger as well!!!

Re: Supercookie: Browser Fingerprinting via Favicon

#10

Post by fergbrain » Sun, Feb 07, 2021, 2:33 AM UTC

crashdelta wrote: post #5

It doesn't work in FireFox 85.0 x64 on Windows. I went to the site, did the demo, my number was A5 94 D6 7E 4A DE and when I came back in private mode it was 51 ED 26 D8 66 FC.

Same on Safari in iOS (latest version as of this date).