To limit the traceability of your navigation on the Internet, the CNIL recommends that you block, if they exist, third party cookies.
Third-party cookies are usually not needed to enjoy the resources of the site you are on.
General on cookies
Definition of cookie
A cookie is a small information file (in text format) recorded on your computer by your browser at the request of the website you visit.
Some sites do not use, for others they are necessary for their normal operation and for others they can be used for commercial purposes.
The cookie allows you to assign your computer a profile or quality, at least during the duration of your navigation on the site.
A cookie created by a website can not be read by another site, which immediately limits the risks of security.
It can not contain private information if you have entered them in a form of the website concerned.
No browser or website can not guess your name, mailing address, email address ... This is the reason why the profile or the quality of a cookie is assigned to your computer, specifically to your browser, and not to your person.
The usefulness of cookies: the session
A session corresponds to the period between the moment when a user arrives on a website and the moment he leaves him.
In the meantime it performs a number of actions some of which must be recorded, for example:
- Its choices regarding the interface of the site: Number of results per page in a search engine, colors, font ...
- Identify a member in a forum or chat to avoid having to identify oneself without stopping
- on a business website, keep the contents of its caddy
- Save the topics that interest it
The communication protocol does not allow the website or to identify a computer or to maintain the context of the session. The cookie is the only solution.
It is sometimes interesting also to keep the cookie identifying a session, for example:
- (at the limit) save his pseudonym and password once and for all not to retype them at each visit
- Knowing how many visitors come back (this is a critical information for a site that seeks to retain)
Without cookies, the functions of improving navigation comfort, personalized services and trade would be much more limited on the web.
The life of a cookie
The lifetime of a cookie is initially fixed by the site:
- Session cookies are disabled by the issuer site, your disconnection or at the end of your visit
- Persistent cookies have a larger or even infinite duration
But the browser options make it possible to refuse them all, to filter them on different criteria or to remove them automatically at the closing of the browser.
Is it possible to prohibit cookies?
- Browsers can disable or reactivate cookies
- Several levels of cookies can be managed by browsers
- the deactivation of all cookies may prohibit certain features from the site and even completely prohibit its functioning
Generally in browsers, by default cookies are accepted.
Here under Firefox. How to activate or disable cookies.
Similar procedures exist with other browsers
Is it possible to see the cookies of a site
Can authentication cookies serve piracy?
- A cookie recorded by a site can not be read by another site,
- The cookie being small text recorded on your hard drive, a pirate program installed on your computer can steal this cookie.
- That the information present in the cookie is encrypted or not preventing hacking. But the websites that record logon / password in a cookie are very rare today, it replace them very often by a number identifying your session.
- Piracy can only succeed during your session, so it is strongly recommended to always disconnect from a web service to limit the risk.