Télécharger C'est dommage de savoir qu'il y a encore des pays et des régions où la connexion à Internet et le droit à l'information n'est pas libre et universel. Des endroits où surfer à certaines localisations est simplement impossible mais les applications comme GPass prétendent de les libérer. Devenez vraiment anonyme en étant sur le navigateur GPass est, comme beaucoup d'autres, un logiciel pour naviguer dans le réseau de manière anonyme et codée, pour réussir à contrôler les sites à visiter ou les logiciels utilisés. Pour cela, GPass incorpore une liste de logiciels qui assure la connexion et crée des tunnels pour transmettre les données.

Nom:gpass proxy
Format:Fichier D’archive
Système d’exploitation:Windows, Mac, Android, iOS
Licence:Usage Personnel Seulement
Taille:19.23 MBytes

Proxy servers implement one or more of the following functions: Caching proxy server A caching proxy server accelerates service requests by retrieving content saved from a previous request made by the same client or even other clients. Caching proxies keep local copies of frequently requested resources, allowing large organizations to significantly reduce their upstream bandwidth usage and cost, while significantly increasing performance.

Most ISPs and large businesses have a caching proxy. These machines are built to deliver superb file system performance often with RAID and journaling and also contain hot-rodded versions of TCP. Caching proxies were the first kind of proxy server.

Some poorly-implemented caching proxies have had downsides e. Another important use of the proxy server is to reduce the hardware cost. An organization may have many systems on the same network or under control of a single server, prohibiting the possibility of an individual connection to the Internet for each system. In such a case, the individual systems can be connected to one proxy server, and the proxy server connected to the main server.

Web proxy A proxy that focuses on World Wide Web traffic is called a "web proxy". The most common use of a web proxy is to serve as a web cache. Most proxy programs provide a means to deny access to URLs specified in a blacklist , thus providing content filtering. This is often used in a corporate, educational or library environment, and anywhere else where content filtering is desired.

Some web proxies reformat web pages for a specific purpose or audience, such as for cell phones and PDAs. AOL dialup customers used to have their requests routed through an extensible proxy that 'thinned' or reduced the detail in JPEG pictures. This sped up performance but caused problems, either when more resolution was needed or when the thinning program produced incorrect results.

This is why in the early days of the web many web pages would contain a link saying "AOL Users Click " to bypass the web proxy and to avoid the bugs in the thinning software. Content-filtering web proxy Further information: Content-control software A content-filtering web proxy server provides administrative control over the content that may be relayed through the proxy.

It is commonly used in both commercial and non-commercial organizations especially schools to ensure that Internet usage conforms to acceptable use policy. In some cases users can circumvent the proxy, since there are services designed to proxy information from a filtered website through a non filtered site to allow it through the user's proxy.

Some products have been known to employ content analysis techniques to look for traits commonly used by certain types of content providers. A content filtering proxy will often support user authentication , to control web access. It also usually produces logs , either to give detailed information about the URLs accessed by specific users, or to monitor bandwidth usage statistics. Anonymizing proxy server An anonymous proxy server sometimes called a web proxy generally attempts to anonymize web surfing.

There are different varieties of anonymizers. One of the more common variations is the open proxy. Because they are typically difficult to track, open proxies are especially useful to those seeking online anonymity, from political dissidents to computer criminals. Some users are merely interested in anonymity for added security, hiding their identities from potentially malicious websites for instance, or on principle, to facilitate constitutional human rights of freedom of speech , for instance.

The server receives requests from the anonymizing proxy server, and thus does not receive information about the end user's address. However, the requests are not anonymous to the anonymizing proxy server, and so a degree of trust is present between that server and the user. Many of them are funded through a continued advertising link to the user. Access control: Some proxy servers implement a logon requirement. In large organizations, authorized users must log on to gain access to the web.

The organization can thereby track usage to individuals. A website could still suspect a proxy is being used if the client sends packets which include a cookie from a previous visit that did not use the high anonymity proxy server. Clearing cookies, and possibly the cache, would solve this problem. Hostile proxy Proxies can also be installed in order to eavesdrop upon the dataflow between client machines and the web.

All accessed pages, as well as all forms submitted, can be captured and analyzed by the proxy operator. For this reason, passwords to online services such as webmail and banking should always be exchanged over a cryptographically secured connection, such as SSL. Intercepting proxy server An intercepting proxy combines a proxy server with a gateway or router commonly with NAT capabilities. Connections made by client browsers through the gateway are diverted to the proxy without client-side configuration or often knowledge.

Intercepting proxies are also commonly referred to as "transparent" proxies, or "forced" proxies, presumably because the existence of the proxy is transparent to the user, or the user is forced to use the proxy regardless of local settings.

Purpose Intercepting proxies are commonly used in businesses to prevent avoidance of acceptable use policy, and to ease administrative burden, since no client browser configuration is required. This second reason however is mitigated by features such as Active Directory group policy, or DHCP and automatic proxy detection.

Intercepting proxies are also commonly used by ISPs in some countries to save upstream bandwidth and improve customer response times by caching. This is more common in countries where bandwidth is more limited e. Firstly the original destination IP and port must somehow be communicated to the proxy. This is not always possible e.

There is a class of cross site attacks which depend on certain behaviour of intercepting proxies that do not check or have access to information about the original intercepted destination. This problem can be resolved by using an integrated packet-level and application level appliance or software which is then able to communicate this information between the packet handler and the proxy.

Intercepting also creates problems for HTTP authentication, especially connection-oriented authentication such as NTLM , since the client browser believes it is talking to a server rather than a proxy. This can cause problems where an intercepting proxy requires authentication, then the user connects to a site which also requires authentication. Finally intercepting connections can cause problems for HTTP caches, since some requests and responses become uncacheble by a shared cache.

Therefore intercepting connections is generally discouraged. Detecting It is often possible to detect the use of an intercepting proxy server by comparing the client's external IP address to the address seen by an external web server, or sometimes by examining the HTTP headers received by a server.

A number of sites have been created to address this issue, by reporting the user's IP address as seen by the site back to the user in a web page. Transparent and non-transparent proxy server The term "transparent proxy" is most often used incorrectly to mean "intercepting proxy" because the client does not need to configure a proxy and cannot directly detect that its requests are being proxied.

This proprietary protocol resides on the router and is configured from the cache, allowing the cache to determine what ports and traffic is sent to it via transparent redirection from the router. A security flaw in the way that transparent proxies operate was published by Robert Auger in [1] and advisory by the Computer Emergency Response Team [2] was issued listing dozens of affected transparent, and intercepting proxy servers.

Forced proxy The term "forced proxy" is ambiguous. It means both "intercepting proxy" because it filters all traffic on the only available gateway to the Internet and its exact opposite, "non-intercepting proxy" because the user is forced to configure a proxy in order to access the Internet. For instance, interception of HTTP requests can affect the usability of a proxy cache, and can greatly affect certain authentication mechanisms.

This is primarily because the client thinks it is talking to a server, and so request headers required by a proxy are unable to be distinguished from headers that may be required by an upstream server esp authorization headers.

Also the HTTP specification prohibits caching of responses where the request contained an authorization header. Suffix proxy A suffix proxy server allows a user to access web content by appending the name of the proxy server to the URL of the requested content e.

Suffix proxy servers are easier to use than regular proxy servers. The concept appeared in in form of the IPv6Gate and in in form of the Coral Content Distribution Network , but the term suffix proxy was only coined in October by " 6a.

Open proxy server Main article: Open proxy Because proxies might be used to abuse, system administrators have developed a number of ways to refuse service to open proxies. Many IRC networks automatically test client systems for known types of open proxy. Likewise, an email server may be configured to automatically test e-mail senders for open proxies. The ethics of automatically testing clients for open proxies are controversial.

Some experts, such as Vernon Schryver, consider such testing to be equivalent to an attacker portscanning the client host. Reverse proxy server Main article: Reverse proxy A reverse proxy is a proxy server that is installed in the neighborhood of one or more web servers.

All traffic coming from the Internet and with a destination of one of the web servers goes through the proxy server. See Secure Sockets Layer. Load balancing : the reverse proxy can distribute the load to several web servers, each web server serving its own application area. In such a case, the reverse proxy may need to rewrite the URLs in each web page translation from externally known URLs to the internal locations.

Compression: the proxy server can optimize and compress the content to speed up the load time. Spoon feeding: reduces resource usage caused by slow clients on the web servers by caching the content the web server sent and slowly "spoon feeding" it to the client.

This especially benefits dynamically generated pages. Security: the proxy server is an additional layer of defense and can protect against some OS and WebServer specific attacks. However, it does not provide any protection to attacks against the web application or service itself, which is generally considered the larger threat. Extranet Publishing: a reverse proxy server facing the Internet can be used to communicate to a firewalled server internal to an organization, providing extranet access to some functions while keeping the servers behind the firewalls.

If used in this way, security measures should be considered to protect the rest of your infrastructure in case this server is compromised, as its web application is exposed to attack from the Internet. Tunneling proxy server A tunneling proxy server is a method of defeating blocking policies implemented using proxy servers. Most tunneling proxy servers are also proxy servers, of varying degrees of sophistication, which effectively implement "bypass policies".

A tunneling proxy server is a web-based page that takes a site that is blocked and "tunnels" it, allowing the user to view blocked pages. A famous example is elgooG, which allowed users in China to use Google after it had been blocked there.

Students are able to access blocked sites games, chatrooms , messenger, offensive material, internet pornography , social networking, etc. As fast as the filtering software blocks tunneling proxy servers, others spring up.

However, in some cases the filter may still intercept traffic to the tunneling proxy server, thus the person who manages the filter can still see the sites that are being visited.

Tunneling proxy servers are also used by people who have been blocked from a web site. Another use of a tunneling proxy server is to allow access to country-specific services, so that Internet users from other countries may also make use of them. An example is country-restricted reproduction of media and webcasting. The use of tunneling proxy servers is usually safe with the exception that tunneling proxy server sites run by an untrusted third party can be run with hidden intentions, such as collecting personal information, and as a result users are typically advised against running personal data such as credit card numbers or passwords through a tunneling proxy server.

In some network configurations, clients attempting to access the proxy server are given different levels of access privilege on the grounds of their computer location or even the MAC address of the network card. However, if one has access to a system with higher access rights, one could use that system as a proxy server for which the other clients use to access the original proxy server, consequently altering their access privileges.

Content filter Many work places, schools, and colleges restrict the web sites and online services that are made available in their buildings. This is done either with a specialized proxy, called a content filter both commercial and free products are available , or by using a cache-extension protocol such as ICAP , that allows plug-in extensions to an open caching architecture.


Comment contourner la censure sur Internet ?

Proxy servers implement one or more of the following functions: Caching proxy server A caching proxy server accelerates service requests by retrieving content saved from a previous request made by the same client or even other clients. Caching proxies keep local copies of frequently requested resources, allowing large organizations to significantly reduce their upstream bandwidth usage and cost, while significantly increasing performance. Most ISPs and large businesses have a caching proxy. These machines are built to deliver superb file system performance often with RAID and journaling and also contain hot-rodded versions of TCP.


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