How data is encrypted on the internet

From plain data to ciphertext

Suppose an app needs to send a server a message. In its original form the data has a clear structure: text, an image, a request, or some other set of bytes.

In cryptography that starting material is called plaintext. The name does not mean human-readable text is involved: it is simply any data before encryption.

An encryption algorithm, together with a key, turns it into ciphertext. To an observer without the right key, the result should look like data from which the original content cannot realistically be recovered.

The recipient, holding what is needed to decrypt, performs the reverse transformation.

The security of modern cryptography does not rest on keeping the algorithm secret. Algorithms are often public, studied in detail by specialists and standardised. What stays secret is the key.

Why the key matters more than a secret algorithm

Early protection schemes often relied on an adversary not knowing the method. Modern cryptography works from a stricter assumption: a system should stay secure even when its inner workings are public knowledge.

That makes the key the central element.

Think of it as a very large random value that determines one particular transformation of the data. Knowing the algorithm without the right key should not allow anyone to decrypt a message in any practical amount of time.

Keys have to be generated reliably and stored so that nobody else can get to them.

Which raises the next question: how do two parties arrive at a shared secret when they do not yet have a protected channel? That is where asymmetric cryptography and key exchange come in.

Asymmetric cryptography helps set up a protected connection

Asymmetric systems use a related pair of keys: one public, one private.

The public key can be handed to anyone. The private one has to stay secret.

That construction solves problems ordinary symmetric encryption handles awkwardly: confirming authenticity, creating digital signatures, and agreeing on secret values across an unprotected network.

In modern protocols, two parties can use a cryptographic key exchange to arrive independently at a shared secret without ever sending that secret over the network in the clear.

The traffic that follows is not usually encrypted with asymmetric algorithms end to end. For large volumes of data there are much faster symmetric methods.

Symmetric encryption protects the main flow of data

With symmetric encryption, both sides use a shared secret key to protect and decrypt data.

Such algorithms are extremely efficient and well suited to moving large volumes continuously: web pages, video, files and network traffic.

AES is one of the best-known symmetric standards. In modern network systems the AES-GCM mode comes up frequently.

Another widely used example is ChaCha20-Poly1305. It pairs the ChaCha20 stream cipher with the Poly1305 integrity check, and is particularly convenient for software implementations on devices without dedicated AES hardware acceleration.

What matters to you is less the names of the algorithms than the properties of a modern scheme: the data has to stay confidential, and any attempt to alter it quietly has to be detected.

That is precisely why authenticated encryption is now the norm.

Encryption has to protect integrity, not just secrecy

Making data unreadable is not enough on its own.

Imagine an attacker who cannot understand the contents of an encrypted message but can quietly alter parts of it. In some systems that ability is a risk in itself.

So modern schemes commonly provide confidentiality and integrity checking together.

AES-GCM and ChaCha20-Poly1305 belong to the family of approaches that not only encrypt data but also verify it has not been changed by anyone without the corresponding key.

That class of mechanism is known as authenticated encryption.

If the check fails, the recipient knows the data is damaged or altered and should not process it as a valid message.

It is an essential part of modern protected protocols.

TLS protects your connection to a site

When a browser opens an HTTPS site, it normally uses TLS.

TLS does several jobs. It lets the browser verify that the connection is being established with a server holding valid credentials for the domain in question. The two sides then agree on the parameters of a protected session and derive keys.

After that, the main flow of data is carried with efficient symmetric encryption.

Thanks to TLS, someone on the same Wi-Fi network or an operator in the middle does not get the contents of an HTTPS page in the clear.

It is TLS that protects the sign-in form on a modern site, whether or not a VPN is in use.

TLS works for one particular connection between an app and a service. A VPN adds protection at a different network layer.

What a VPN adds on top of HTTPS

A VPN creates a protected connection between your device and the VPN infrastructure.

Internet traffic routed through the VPN travels inside that connection. To the local network or your internet provider it looks like an exchange of data with the VPN infrastructure, and the contents of the protected connection are encrypted.

On top of that, the browser can still use HTTPS all the way to the destination site.

So there are two layers: the VPN protects the stretch from your device to the VPN network, and TLS protects the specific connection between an app and the HTTPS service at the end.

The two do not simply duplicate each other. They protect data in different contexts, which is why they work together perfectly well.

MaskNet uses modern protocols and protected data transfer technology, combining them with smart routing and distributed network infrastructure.