Most online privacy guides focus on passwords and VPNs. They overlook a layer of defense that operates upstream of any interaction with a site: DNS resolution. Configuring a privacy-focused DNS resolver changes how your device translates each domain name into an IP address, and this step even precedes the encryption of traffic by a VPN.
Private DNS Resolver: The Layer of Protection That Guides Forget
Every web request starts with a DNS query. By default, this query is sent in plain text to your ISP’s resolver, which can log it, sell it, or share it upon legal request. Replacing this resolver with a service like Quad9, NextDNS, or Cloudflare 1.1.1.1 cuts off this leak at the source.
You may also like : How Presence Management Solutions Boost Your Brand's Online Visibility
The change can be made in just a few minutes in the network settings of the operating system, or directly on the router to cover all devices in the household. We recommend enabling the DoH (DNS over HTTPS) or DoT (DNS over TLS) protocol to encrypt these queries. Without this encryption, even a third-party resolver remains readable by a network intermediary.
NextDNS adds an extra dimension: customizable block lists that filter out advertising tracking domains and malicious domains at the DNS level, before the browser loads anything. This approach complements a traditional ad blocker, as it also acts on mobile applications and connected devices.
See also : How to Easily and Effectively Optimize Your Professional Artisan Profile Online
Specialized digital security providers, like those found at j3m.fr, assist businesses and individuals in setting up these network configurations.
Email Aliases and Pseudonymization: Segregating Your Digital Identities
Using the same email address across all services creates a unique identifier that allows any data broker to cross-reference your accounts. The most effective workaround in 2025-2026 relies on email alias services like SimpleLogin or AnonAddy.
The principle: each online registration receives a randomly generated address that redirects to your main inbox. If one of these aliases is compromised or sold, you can disable it without touching your real address. Segregation prevents correlation between accounts.
The CNIL recommends the systematic use of pseudonyms when real identity is not legally required. Combining a unique pseudonym per platform with a dedicated email alias makes re-identification through database cross-referencing significantly more difficult.
Concrete Implementation
- Create a SimpleLogin account (free version: multiple aliases) and link it to your main email inbox via the chosen transfer protocol (IMAP or simple forwarding)
- Generate a distinct alias for each category of service (online shopping, social networks, newsletters, administration) to trace the origin of any potential spam
- On mobile applications, use a different pseudonym for each social network to limit the correlation between profiles by a search engine or scraper
Application Permissions and Default Privacy: What Has Changed
Since 2023, Apple, Google, and Meta have modified permission management on their mobile operating systems. Location, access to the microphone, camera, and contacts are now offered with restrictive default settings or require explicit confirmation for each use.
This evolution reduces passive exposure, but it does not exempt you from manually checking granted permissions. A flashlight app that maintains permanent access to GPS remains a common case. The reflex to adopt: review the permissions of each installed application once a quarter.
Settings to Audit as a Priority
- Location: switch all non-mapping applications to “Never” or “Only while using”
- Access to contacts: systematically deny except for the messaging apps you actually use to call your contacts
- Advertising tracking (inter-app tracking): disable on iOS via Settings > Privacy > Tracking, and on Android via Google privacy settings
- Automatic deletion of location history: enable deletion after a maximum of three months in Google or Apple account settings
Password Manager and Strong Authentication: The Technical Foundation
A password manager (KeePassXC, Bitwarden) generates and stores a unique password per service in a locally encrypted vault. Reusing the same password across multiple sites remains the leading cause of account compromise. The manager eliminates this risk without the need for memorization.
Two-factor authentication (2FA) adds an extra barrier. We recommend a TOTP app (FreeOTP, Aegis Authenticator) rather than SMS, which is documented to be intercepted through SIM-swapping. Physical FIDO2 keys (YubiKey, SoloKeys) offer the highest level of protection for sensitive accounts.
VPN: Useful Under Certain Conditions
A VPN encrypts the traffic between your device and the provider’s server, which protects the connection on a public Wi-Fi network. However, a VPN does not make you anonymous: the VPN provider sees your traffic instead of your ISP. The choice of provider (audited no-logging policy, jurisdiction) conditions the actual gain in privacy.
Combining an encrypted DNS resolver, an audited VPN, and a browser configured to block third-party cookies (Firefox with uBlock Origin, or Brave) creates a coherent set. Each layer covers a blind spot of the previous one: the DNS filters upstream, the VPN masks the IP address, the browser blocks application tracking.
Online privacy protection does not require advanced skills, but it does demand layering multiple tools that act at different levels of the network. An email alias protects identity, an encrypted DNS blocks query leaks, and regularly reviewed permissions limit silent data collection. Effectiveness comes from the combination, not from a single product.