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Flash Cookies, a Little-Known Privacy Threat

Wiini recommends a blog posting exploring Flash cookies, a little-known threat to privacy, and how you can get control of them. 98% of browsers have Macromedia Flash Player installed, and the cookies it enables have some interesting properties. They have no expiration date; they store 100 KB of data by default, with an unlimited maximum; they can't be deleted by your browser; and they send previous visit information and history, by default, without your permission. I was amazed at some of the sites, not visited in a year or more, that still had Flash cookies on my machine. Here's the user-unfriendly GUI for deleting them, one at a time, each one requiring confirmation.

11 of 225 comments (clear)

  1. Flash cookies by MyLongNickName · · Score: 5, Funny

    I flashed my cookies once and did a weekend in the slammer.

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    See my journal for slashdot ID's by year. Mine created in 2005. http://slashdot.org/journal/289875/slashdot-ids-by-year
    1. Re:Flash cookies by MyLongNickName · · Score: 3, Funny

      Talk about a privacy threat!

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      See my journal for slashdot ID's by year. Mine created in 2005. http://slashdot.org/journal/289875/slashdot-ids-by-year
  2. Re:Welcome by AKAImBatman · · Score: 5, Funny

    If you think I'm new here, you must be new here... ;-)

  3. Re:Welcome by Drooling+Iguana · · Score: 4, Funny

    In geological terms, we're all new here.

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    ... I'm addicted to placebos
  4. Re:And this ... by Anonymous Coward · · Score: 2, Funny

    Photons are also used by Advertisers. Thats why I ripped my eyes out.

  5. Re:And this ... by elrous0 · · Score: 5, Funny

    And I'm even better than you because I use an Apple computer, don't even own a TV, and only listen to indie music. You should smell my flowery farts!

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    SJW: Someone who has run out of real oppression, and has to fake it.
  6. Re:Don't allow sites to store stuff on your machin by Anonymous Coward · · Score: 5, Funny

    Mod parent "OldManOnPorchWithShotgun"

  7. Re:Old News by marxmarv · · Score: 2, Funny

    SQL database in the browser? Oh christ. It's like emacs all over again.

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    /. -- the Free Republic of technology.
  8. Re:Welcome by Anonymous Coward · · Score: 2, Funny

    Yes, and topologically, we're all donuts.

  9. Re:Macromedia? by josath · · Score: 2, Funny

    Give him a break, that acquisition was only announced three and a half years ago, he may not have heard about it yet. I mean, he's just now hearing about the "flash cookies" which have been around for like six years.

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    sig? uhh, umm, ok
  10. I can't find my C: drive by baomike · · Score: 2, Funny

    Who should I contact?
    Is this a serious problem?