Why is encryption needed in networks?

Encryption in networks is needed to protect data while it is in transit and to make it useless to outsiders, even if the traffic is intercepted.

In simple terms: encryption turns data into an "unreadable set of characters" that only someone with the key can understand.

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#The main problem without encryption

Data on a network travels through:

• the internet,
• routers,
• providers,
• public Wi-Fi.

If the data is not encrypted, it can be:

• eavesdropped on;
• copied;
• altered.

Anyone who intercepts the traffic will see everything "as is."

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#Why encryption is specifically needed

#1. Protecting confidentiality

So that outsiders cannot read the data.

Examples:

• passwords;
• banking data;
• private correspondence;
• corporate information.

Even if the traffic is intercepted, it will be useless.

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#2. Protection from interception (MITM)

Encryption protects against attacks such as:

• sniffing;
• man-in-the-middle.

Without the key, an attacker cannot understand the content or alter it unnoticed.

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#3. Protecting data integrity

Encryption (together with cryptographic mechanisms):

• allows changes to the data to be detected;
• guarantees that the data was not altered along the way.

If the data was changed, the connection is considered invalid.

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#4. Confirming authenticity

Encryption helps confirm that:

• you are communicating with the real server;
• not with a fake one.

This is especially important for websites, banks and APIs.

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#5. Compliance with requirements and standards

In many cases, encryption is:

• required by law;
• required by security standards;
• necessary when working with personal data.

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#Where encryption is used in networks

• HTTPS, protecting web traffic;
• VPN, protecting the connection between networks;
• Wi-Fi, protecting the wireless network;
• email, protecting messages;
• APIs, protecting data exchange between services.

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#Which security properties it provides

Encryption directly supports:

• Confidentiality, the data is hidden;
• Integrity, the data is not altered;
• partly - Authentication, confirming the parties involved.