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<span style="font-size: 20px; font-weight: bold;
color: rgb(0, 0, 0); font-family: arial;
line-height: 110%;">OPLIN 4Cast #246: Zombie
cookies</span><br>
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<span style="font-size: 11px; font-weight: normal;
color: rgb(102, 102, 102); font-style: italic;
font-family: arial;">September 7th, 2011</span></p>
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<p style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.oplin.org/4cast/wp-content/uploads/2011/09/zombie-with-cookie-sm.png"><img
class="alignleft size-full wp-image-2190"
title="zombie with cookie"
src="cid:part2.07080508.07090503@oplin.org"
alt="" height="144" width="153"></a>Internet
websites routinely use browser "cookies," small
files that collect and store data about website
visitors and their activities. Cookies are
necessary for a smooth Internet user experience;
otherwise, for example, you'd be constantly
entering and re-entering your username and
password on limited-access sites. But cookies are
designed to have a set "time-to-live" after which
they go away, or the user is also supposed to be
able to block or kill them. Companies that collect
Internet usage data for marketing purposes,
however, don't want their cookies to die, so they
might take the sneaky step of creating user
cookies that cannot be killed: zombie cookies,
also known as evercookies or supercookies. Some
very big companies use them, which makes privacy
advocates concerned and angry.
</p>
<div> </div>
<ul style="text-align: left;">
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.ensighten.com/node/185">Super
cookies, ever cookies, zombie cookies, oh my!</a>
(Ensighten blog/Josh Goodwin) "The internet, as
we noted earlier, was designed to allow for a
very narrow allowance of data storage and
retrieval on end-user systems. As companies
build value around data collection, the
motivation to break out of that narrow privacy
oriented data protection scheme has also grown.
The company that provides website owners with
the most relevant and accurate information about
how users interact with the website owner's site
has an advantage over other companies looking to
do the same thing."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://mashable.com/2011/09/02/supercookies-internet-privacy/">Supercookies:
what you need to know about the web's latest
tracking device</a> (Mashable/Christian Olsen)
"The kind of data supercookies track isn't
typical cookie material. A browser limits the
typical cookie to be written, read and
ultimately removed by the site that created it.
The supercookie, on the other hand, operates
outside of established safeguards. It can track
and record user behavior across multiple sites.
While it's easy to understand that a site would
want to track a user's activity while she
navigates its turf, it's ethically questionable
that site operators are able to record a user's
actions beyond site parameters."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://techcitement.com/software/attack-of-the-zombie-cookies/">Attack
of the zombie cookies</a> (Techcitement*/Tom
Wyrick) "This time, both a cache-based cookie
and a more advanced 'supercookie' are used to
survive users' attempts to block or delete them.
Microsoft implements both methods by use of a
script called wlHelper.js, which they store
along with a cookie in the browser cache. If a
user deletes the cookie but doesn't empty the
browser cache, the script recreates the deleted
cookie. The second approach, termed ETags, saves
a bogus version number in the browser cache. In
the event the cookie is erased, wlHelper.js
retrieves it from the bogus version number."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.infoworld.com/t/internet-privacy/zombie-cookies-wont-die-microsoft-admits-use-and-html5-looms-new-vector-170511">'Zombie
cookies' won't die: Microsoft admits use,
HTML5 looms as new vector</a> (InfoWorld/Woody
Leonhard) "Perhaps even scarier, as HTML5 gains
traction: Its local storage is a great feature,
but one wide open for abuse for such items as
zombie cookies. And Internet Explorer's
InPrivate Browsing, Firefox's Private Browsing,
and Chrome's Incognito browsing modes won't
protect you from the ETag form of zombie cookies
or from HTML5-based zombies."</li>
</ul>
<div style="text-align: left;"> </div>
<p style="text-align: left; font-size: 20px;
font-family: arial; line-height: 110%;"><small><strong><em>Anniversary
fact:</em></strong></small><br>
</p>
<div style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;">The
evercookie code was released as open source
software on September 13, 2010 by <a
href="http://samy.pl/">Samy Kamkar</a>, who also
created the worm that disabled the MySpace website
in 2005.
</div>
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