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Man reveals secret recipe behind undeletable cookies
Topic Started: Sep 6 2011, 04:57 PM (72 Views)
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Deleted User

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Man reveals secret recipe behind undeletable cookies
New and improved cookie 'respawning' revealed
By Dan Goodin in San Francisco

A privacy researcher has revealed the evil genius behind a for-profit web analytics service capable of following users across more than 500 sites, even when all cookie storage was disabled and sites were viewed using a browser's privacy mode.

The technique, which worked with sites including Hulu, Spotify and GigaOm, is controversial because it allowed analytics startup KISSmetrics to construct detailed browsing histories even when users went through considerable trouble to prevent tracking of the websites they viewed. It had the ability to resurrect cookies that were deleted, and could also compile a user's browsing history across two or more different browsers. It came to light only after academic researchers published a paper late last month.

At the heart of the technique is the practice of storing a unique identifier, known as an ETag value, in a browser's cache and metadata folders. A piece of JavaScript hosted on kissmetrics.com accesses the serial number each time one of the KISSmetrics websites is viewed. “It's effectively acting like a cookie because with every connection to KISSmetrics, it will send a referrer header and the ETag value,” Soltani told The Register. “The ETag is effectively acting as a cookie. It has the same exact value of the cookie as well.”


More details here: http://www.theregister.co.uk/2011/08/16/cookie_respawning_secrets_revealed/
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Trotsky
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Big City Boy
I noticed similar with some Porn Site visiting using Browse in Private. When visiting my cookie file I tried to delete bunches of detritius and came upon a couple hundred or so that were merely numbers lke 0000001, 0000001 (a bunch of them and then 0000002.
When I laid the mouse over them the name of the website showed. Seems each picture gets a cookie...waste of space.
They are absolutely undeletable manually.

Perhaps I will try deleting all cookies but that means putting in all my passwords and screennames again and the offenders may still nor disappear.

I'm not shy about my browsing activity but I have a pretty full hard drive and don't need it filled with nonsense.
Edited by Trotsky, Sep 15 2011, 02:27 AM.
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Trotsky
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Big City Boy
And now the 000001's all disappeared????
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