Security Defined Cybersecurity EncyclopediaEn quoi consiste la sécurité zero-trust ?

Zero Trust Security

What is Zero Trust?

Zero trust is a security model based on the premise that no one is blindly trusted and allowed to access company assets until they have been validated as legitimate and authorized. It supports the implementation of ‘least privilege access’, which is designed to selectively grant access to only the resources that users or groups of users require, nothing more. Additionally, those who are granted access to the network, data, and other assets are continuously required to authenticate their identity

Zero trust adoption has accelerated in response to the rapid rise of mobile and remote workers, the bring your own devices (BYOD) trend, shadow IT, and the rapid rise of cloud services. While these trends benefited users and brought new levels of flexibility to IT, they also reduced the ability of the organization to control and secure access to data and network resources. Zero trust brings this control back, tightening up security in the face of a dissolving network perimeter.

Think of your network and data infrastructure as a building full of rooms with locked doors and each lock has its own individual key and you only grant users access only to the room with assets that they need and nothing else. That is zero trust in a nutshell.

what is zero trust security

Blog: Premiers pas avec le Zero Trust
White Paper: Zero Trust Leading Practice


A Brief History of Zero Trust

The term “zero trust” was coined by Forrester analyst John Kindervag in his research as he explained the importance of inherent “non-trust” when dealing with network traffic, no matter where it comes from. The concept originated as a network security term and rightfully so, since most businesses operated on their own in-house networks and data storage capacities at the time the concept originated.

However, many of the notions expressed in zero trust networking can trace their origins to a much earlier concept, put forth in 2004 by the Jericho Forum, called de-perimeterization. Perimeter security is conducted by means of firewalls and perimeter guarding for the purposes of keeping out intruders. The flaw in this strategy is the lack of safeguards once intruders are able to breach the perimeter. De-perimeterization is a security strategy of removing the standard “boundary” security separating a network from the internet and instead creating a segmented and multi-layered security system built on encryption and authentication. Zero trust architecture (ZTA) provides layered security by means of constant reauthentication and inherent distrust of all devices, users, and actions whether they exist within the perimeter or not.


The Future of Zero Trust

Today, zero trust has evolved to encapsulate more of a general concept than just a network specific architecture. The concept is gaining foothold among all industry players and while the two most common applications of zero trust exist in network (Zero Trust Network Access) and data (Zero Trust Data Protection) spaces, this security model is expanding into other realms, such as:

  • Zero trust workloads
  • Zero trust user bases
  • Zero trust automation
  • Zero trust devices

Le modèle Zero Trust est là pour durer, mais il a besoin d'une nouvelle approche cloud-first en matière de sécurité afin d'être mis en place. En raison de l'augmentation du nombre de travailleurs distants et de l'adoption massive d'environnements cloud, les stratégies centrées sur le réseau ne sont tout simplement plus aussi efficaces qu'avant lorsqu'il s'agit de réduire les menaces de cybersécurité. Le caractère dynamique et les nouvelles exigences de ces travailleurs à distance et de ces environnements cloud ébranlent les architectures de sécurité traditionnelles, à tous les niveaux.

Compte tenu de l'explosion du nombre de travailleurs distants qui accèdent aux ressources et aux données de l'entreprise, et compte tenu de l'augmentation d'applications privées hébergées dans des clouds publics, les entreprises se trouvent dans l'obligation d'étendre leur périmètre de sécurité bien au-delà des murs de leur entreprise. En d'autres termes, les approches traditionnelles de contrôle d'accès s'avèrent inadéquates : elles ne sont pas en mesure de protéger les données face à des utilisations non autorisées ou face à des menaces de plus en plus complexes et ciblées.

Par chance, les technologies Zero Trust se sont perfectionnées et peuvent désormais répondre à ces nouvelles exigences. En matière de sécurité, le Zero Trust adopte essentiellement une approche de « refus par défaut », c'est-à-dire que tous les utilisateurs et périphériques qui tentent d'accéder au réseau doivent d'abord être vérifiés. Les nouvelles solutions d'accès réseau Zero Trust basées sur le cloud sont hautement évolutives et offrent aux utilisateurs un accès sécurisé aux applications, et non au réseau. Résultat : les applications et les données privées sont efficacement protégées de toute utilisation malveillante ou de tout piratage informatique.


What are the Principles of Zero Trust?

These are the three core principles that guide the zero trust model:


1. Grant the Least Amount of Privileges

The base principle of zero trust centers around the idea of granting the least amount of privilege and access as possible without impacting an individual’s ability to complete their tasks. You only grant access on a case-by-case basis to exactly what is needed and nothing else.


2. Never Trust, Always Verify

No action or user is inherently trusted within a zero trust security model. Every new entry into a system or request for access to new data must come with some form of authentication to verify the identity of the user.


3. Always Monitor

Lastly, zero trust requires consistent monitoring and evaluation of user behavior, data movements, network changes, and data alterations. While authentication and privilege restrictions are the backbone of zero trust, it’s always best to verify all actions taken within your organization’s infrastructure.


What are the Types of Zero Trust?

Implementing a zero trust model protects private applications, sensitive data, and network assets, while drastically reducing risks from malicious insiders and compromised accounts.

There are two current and distinct applications for the zero trust model:

  • Zero Trust Network Access (ZTNA)
  • Zero Trust Data Protection (ZTDP)


What is Zero Trust Network Access?

When designing a zero trust strategy for remote access to an environment, it is commonly referred to as Zero Trust Network Access (ZTNA) but is also known as a Software-Defined Perimeter (SDP). A ZTNA or SDP is a modern way to secure access to the network, which uses a cloud-first, software-based approach to replace the hardware of legacy VPNs. It creates an overlay network that securely connects users and devices over the Internet to the servers and applications they need in the data center or public cloud.

A ZTNA solution offers the following benefits:

  • Sécurisation efficace des accès des utilisateurs à distance
  • Garantie d'une authentification robuste
  • Mise en place d'une gouvernance efficace de l'accès aux ressources
  • Réduction du potentiel de vulnérabilité et des dommages
  • Prise en charge d'initiatives d'audit de conformité
  • Accélération de la transition vers le cloud
  • Transformation de la sécurité – remplacements de VPN et adoption de solutions définies par logiciel

La plupart des entreprises adoptent un modèle Zero Trust pour bénéficier d'une visibilité totale et d'un contrôle complet sur les utilisateurs et les périphériques, lesquels accèdent à toujours plus d'applications cloud et de services de données. Il peut s'agir d'applications managées au sein de l'écosystème de l'entreprise, mais également d'applications non managées, utilisées par certains secteurs et individus de l'entreprise.


What is Zero Trust Data Protection?

On the other hand, you have Zero Trust Data Protection (ZTDP), a new security framework created by Netskope which applies the core principles of zero trust when guarding your data from unauthorized viewing, movement, alteration, and exfiltration.

ZTDP benefits include:

  • Continuous risk assessment
  • Data context and sensitivity awareness, for better policy enforcement
  • Enables safe access-from-anywhere
  • Ensures data is protected everywhere
  • Adherence to current compliance standards

The addition of other tools like analytics platforms and inline visibility to cloud, web, and network usage allows these administrators to tailor their zero trust rules and prevent unauthorized lateral movement to other sets of data. All in all, Zero Trust Data Protection is a first line of defense against unauthorized data access and exfiltration.

Report: Cybersecurity Insiders – Zero Trust Report 2020
Report: 2020 Gartner Market Guide for Zero Trust Network Access

While both of these concepts utilize zero trust, ZTNA deals with applying the zero trust model strictly for the purposes of guarding network access, while ZTDP applies zero trust to the protection of access to data. In a perfect world, companies would utilize both concepts as a safeguard against network intrusions and data exfiltrations/alterations.


Gartner : prédictions et insights du modèle Zero Trust


80% of new digital business applications will be accessed through ZTNA60% of enterprises will phase out most of their remote access VPNs in favor of ZTNA

des nouvelles applications numériques des entreprises seront accessibles via ZTNA


des entreprises supprimeront la plupart de leurs VPN d'accès à distance au profit du modèle ZTNA

Source : rapport Gartner « The Future of Network Security Is in the Cloud »
(L'avenir de la sécurité des réseaux réside dans le Cloud)


How Does Zero Trust Fit Within the Netskope Security Infrastructure?

Pour être pleinement efficaces dans les environnements cloud-first d'aujourd'hui, qui sont de plus en plus distribués et mobiles, les solutions Zero Trust doivent combiner un large éventail de capacités et de technologies : authentification à plusieurs facteurs (MFA), gestion des identités et des accès (IAM), chiffrement, scoring, autorisations des systèmes de fichiers, etc.

In terms of Netskope, our Private Access solution is specifically designed to support diverse environments as a cloud-native ZTNA platform. It combines comprehensive access policy management, compliance assessment, integration with existing IAM and security information and event management (SIEM) solutions; and it supports any application, and any protocol – to simplify network and security operations.

The solution also provides extended protection through integration with the Netskope Next Generation Secure Web Gateway (NG SWG), which comprises several integrated cloud-native technologies, including an inline CASB, data loss prevention (DLP), SWG, and advanced threat protection (ATP). This allows the offering to be uniquely capable of providing unified visibility and protection of hybrid-cloud environments and enhancing latency-sensitive security functions such as DLP and ATP.

Autrement dit, Netskope Private Access offre une approche innovante à l'accessibilité Zero Trust, pour n'importe quelle application, dans n'importe quel environnement.

Data Sheet: Netskope Private Access



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