A VPN, or virtual private network, creates an encrypted tunnel between a device and a remote server before data travels over the public network. This mechanism masks the user’s real IP address and makes the traffic unreadable to any intermediary, from the internet service provider to the operator of a Wi-Fi access point. Understanding what this tunnel protects, and what it does not protect, allows for an informed choice.
Traffic Encryption and VPN Tunnel: What Happens Technically
When a VPN is activated, all outgoing traffic from the device is encapsulated in a encryption protocol before reaching the network. The VPN server then decrypts the packets and forwards them to the requested site or service. The response follows the reverse path.
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This process has two concrete effects. The internet service provider only sees an opaque flow to a unique address, that of the VPN server. And the site visited receives the IP address of the server, not that of the user.
In recent years, the WireGuard protocol has become the standard among most providers. Compared to OpenVPN, it offers equally robust encryption with significantly better speeds, which reduces the noticeable slowdown during streaming or downloading. Several providers also offer proprietary implementations based on WireGuard, tailored to their infrastructures.
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Knowing that you can use a VPN for secure browsing does not exempt you from checking which protocol is actually activated in the application. A VPN configured on an outdated protocol (PPTP, for example) provides largely insufficient protection.
Browser-integrated VPN or Full VPN: A Distinction Not to Miss
Some browsers like Opera or Vivaldi offer a feature labeled “VPN” directly in their settings. This labeling can be misleading. A browser-integrated VPN only encrypts traffic coming from that browser. Other applications on the device (messaging, email client, online games, cloud synchronization) continue to send their data in clear or through their own channel.
A full VPN, installed as a dedicated application, operates at the operating system level. All traffic from the device passes through the tunnel, regardless of the source application. The difference is comparable to locking a single window versus closing all access points of a building.
How to Spot a Fake Browser VPN
- The service requires no software installation and works only in a tab: it is likely a web proxy, not a VPN.
- The option is found in the browser settings under “privacy” but does not mention any encryption protocol: the protection is limited to the browser’s HTTP traffic.
- No choice of server or country is offered, or the choice is limited to a few locations: the service is often a limited relay, without a true VPN infrastructure.
For a real protection of the internet connection, opting for a dedicated VPN remains the only reliable option to date.
Logging Policy and Audits: The Criterion That Comparisons Overlook
A VPN encrypts traffic, but the VPN provider itself can theoretically see this traffic at the exit point. The central question then becomes: what does it retain?
The majority of providers display a so-called “no-log” policy, meaning they claim not to keep any activity logs. For a long time, this statement was merely a marketing argument, impossible to verify from the outside.
The situation has changed. Several major providers now undergo recurring independent audits conducted by firms like PwC, Deloitte, or KPMG. These audits verify the actual absence of activity logs on the servers and result in published reports. Presse-citron, among other French-speaking tech media, lists in 2026 the presence of these audits as a determining criterion in the choice of a secure VPN.
What an Audit Actually Checks
An auditor examines the server configuration, internal databases, automatic purge processes, and administrative access. The report confirms or denies the consistency between the stated policy and the actual infrastructure. A provider that refuses any external audit or does not publish any results deserves increased scrutiny.
Public Wi-Fi and Personal Data: The Scenario Where the VPN Changes Everything
On a home Wi-Fi network protected by a WPA3 password, the risk of interception remains low. The scenario shifts on a public Wi-Fi network (hotel, train station, café, airport). These networks are often open or protected by a password shared with all users.
Without a VPN, an attacker positioned on the same network can intercept DNS requests (and thus know the visited sites) or exploit vulnerabilities in applications that do not encrypt their exchanges properly. With an active VPN, the encrypted tunnel renders these attacks ineffective since the attacker only sees an opaque flow to the VPN server.
This use case alone justifies the activation of a VPN for anyone who regularly connects to networks they do not control. Private browsing in the browser, often confused with a VPN, does not protect network traffic: it merely refrains from recording the history locally.
Concrete Limits of a VPN for Online Security
A VPN does not protect against phishing if the user clicks on a fraudulent link and enters their credentials on a fake site. It also does not block malware downloaded voluntarily. The encryption of the tunnel ensures the confidentiality of transport, not the reliability of the destination.
- A VPN does not replace a password manager: reused credentials remain vulnerable even behind an encrypted tunnel.
- A VPN does not make you anonymous in the strict sense: the VPN provider knows the real IP address, and cookies or connected accounts still allow tracking.
- A free VPN often funds its infrastructure by collecting and reselling browsing data, which negates the purpose of the service.
The VPN remains a tool for network privacy. Combining it with a properly configured browser, regular updates, and vigilance regarding received links constitutes a much stronger combination than using a VPN alone.