HTTP cookie

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HTTP cookie

(World-Wide Web)
A system invented by Netscape to allow a web server to send a web browser a packet of information that will be sent back by the browser each time it accesses the same server. Cookies can contain any arbitrary information the server chooses to put in them and are used to maintain state between HTTP transactions, which are otherwise stateless. Typically this is used to authenticate or identify a registered user of a website without requiring them to sign in again every time they access it. Other uses are, e.g. maintaining a "shopping basket" of goods you have selected to purchase during a session at a site, site personalisation (presenting different pages to different users) or tracking which pages a user has visited on a site, e.g. for marketing purposes.

The browser limits the size of each cookie and the number each server can store. This prevents a malicious site consuming lots of disk space. The only information that cookies can return to the server is what that same server previously sent out. The main privacy concern is that, by default, you do not know when a site has sent or received a cookie so you are not necessarily aware that it has identified you as a returning user, though most reputable sites make this obvious by displaying your user name on the page.

After using a shared login, e.g. in an Internet cafe, you should remove all cookies to prevent the browser identifying the next user as you if they happen to visit the same sites.

Cookie Central.
References in periodicals archive ?
Their default size is 100 KB, which is 25 times larger than a browser cookie.
The same way browser cookies remember items placed in an online shopping cart or internet browsing history, "context cookies" preserve data collected throughout the customer journey for better, more efficient service when switching between self-service channels or when moving to an agent for human assistance.
Vidyard tracks viewers who load the video player with a unique ID generated through the browser in localStorage or browser cookies.
This theory that a company owns tangible personal property in the form of browser cookies placed on consumers' computers and mobile apps placed on customers' cell phones would dramatically change the nexus landscape," Hedstrom said.
New York and five other states allege that PointRoll unlawfully deployed a browser circumvention technique that allowed it to place browser cookies on consumers' Safari Web browsers despite privacy settings configured to block cookies from third-parties and advertisers between December 13, 2011 and February 15, 2012.
The attached archive contained a spyware program that stole browser cookies, and passwords for FTP clients and email accounts.
To use the service, the user's browser cookies need to be enabled.
Summary: A new tracking device is set to shake up the ad world, but are browser cookies keeping advertisers sweet enough?
A, which is a family of multi component malware that spreads to removable drives, steals sensitive information such as saved banking and FTP credentials and browser cookies.