Lorsque vous visitez plusieurs fois votre site web préféré, vous appréciez que ce site web vous reconnaisse, qu’il vous affiche des messages de bienvenue personnalisés, qu’il se souvienne de vos précédentes visites.

Comment un site web est-il capable de vous reconnaître ? Tout simplement en ayant recours aux cookies.

Qu’est-ce qu’un cookie ?

Un cookie est un petit fichier texte déposé sur votre disque dur par le serveur du site que vous visitez.

Il contient quelques données, notamment :

  • le nom du serveur qui l’a écrit;
  • le plus souvent un identifiant sous forme de N° unique;
  • éventuellement une date d’expiration.

Ces informations sont stockées sur votre ordinateur dans un simple fichier texte auquel un serveur accède pour lire et enregistrer des informations.

Un cookie est obligatoirement rattaché à un nom de domaine unique (celui du serveur qui l’a déposé) de telle sorte que seule une requête provenant du même serveur pourra y accéder.

Un navigateur internet doit pouvoir stocker environ 300 cookies, dont 20 maximum pour un même serveur, chaque cookie pouvant atteindre jusqu’à 4000 octets (env. 4 Ko).

Qui peut écrire et lire les cookies?

Un site internet peut uniquement relire et écrire les cookies qui lui appartiennent.
Un cookie contient au minimum un identifiant unique, identifiant conservé dans une base de données au niveau du serveur. Cet identifiant permet à un site web de reconnaître votre ordinateur à chaque visite.

En outre, il faut être conscient qu’une page sur internet est souvent une agrégation d’informations issues de différents sites, notamment via les bandeaux publicitaires. De ce fait des cookies peuvent être déposés et relus par des sites autres que celui auquel vous accédez directement…
Vous pouvez désactiver l’utilisation de cookies en sélectionnant les paramètres appropriés de votre navigateur. Cependant, une telle désactivation pourrait empêcher l’utilisation de certaines fonctionnalités de ce site.

Comment autoriser ou interdire les cookies ?

Comment paramétrer son navigateur pour accepter ou refuser des cookies
Pour la gestion des cookies et de vos choix, la configuration de chaque navigateur est différente. Elle est décrite dans le menu d’aide de votre navigateur, qui vous permettra de savoir de quelle manière modifier vos souhaits en matière de cookies :

Type de cookie Cookie utilisé Que fait-il ? Renseignements sur les cookies
Ciblage/publicité Suivi des
sites visités		 Fournit des informations anonymes sur les
visiteurs tels que les sites web qu’ils visitent avant et/ ou après avoir visité le site en question		 https://www.ghostery.com/fr/apps/affili.net
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/twitter_button
Performance Statistiques/suivi Fournit des informations anonymes/ agrégées
sur où vous allez et ce que vous faites sur le site
en question et d’autres sites internet		 https://www.ghostery.com/fr/apps/google_analytics
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/google+_platform
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/twitter_badge
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/facebook_connect
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/facebook_social_plugins
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/linkedin_widgets
Fonctionnalité Media sociaux/partage Vous permet de partager des commentaires/ des notes/des pages / des signets et permet de fournir un accès aux réseaux sociaux et outils sociaux en ligne plus facilement https://www.ghostery.com/fr/apps/pinterest

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