What is zero trust?

Zero Trust is a security model that works on the principle: "Never trust by default - always verify."

In simple terms: even if a user or device is already inside the network, it still cannot be automatically trusted.

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#The essence of Zero Trust

In the classic security model, it was assumed that:

• inside the network - you can trust;
• outside - you must defend.

Zero Trust breaks this approach and says:

• there is no trust either inside or outside;
• every access is verified again.

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#Core principles of Zero Trust

#1. Never trust automatically

• It does not matter where the request comes from: the internet or the internal network
• Any access must be verified

An internal network is not the same as a secure network

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#2. Always verify

Before granting access, the following is checked:

• the user (who are you?);
• the device (which computer?);
• the context (where from, when, why).

What is often used:

• multi-factor authentication (MFA),
• device verification,
• session control.

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#3. Least privilege

A user gets:

• only the access they need;
• only for the time they need it.

If access is not needed, it is not granted.

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#4. Continuous control

• access can be revoked at any moment;
• behavior is analyzed continuously.

For example: if behavior becomes suspicious, the session is terminated.

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#Why Zero Trust emerged

Because:

• the cloud and remote work appeared;
• users work from home;
• devices are often insecure;
• a breach of one node gives access to the entire network.

Zero Trust reduces the damage even in the event of a breach.

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#A simple example

Without Zero Trust:

"You are inside the network - go wherever you want"

With Zero Trust:

"Prove who you are, from which device, and why - only then will you get access"

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#Where Zero Trust is applied

• corporate networks;
• cloud services;
• next-generation VPN;
• access to critical systems.