What Internet Traffic Encryption Is, in Plain Terms

What happens to your data when you open a site

When you type a password into a login form or send a message, that data doesn't fly straight to the recipient. The packet passes through a Wi-Fi router, your internet provider's equipment, intermediate nodes, and only then reaches the site's or service's server. At every one of those points, someone could in theory read the traffic — from the owner of an open café hotspot to equipment somewhere along the route. Encryption is a way of turning packet contents into a meaningless string of characters for everyone except the sender and the recipient.

How encryption works: a key, not a spell

At the core of any encryption is a mathematical operation: an algorithm takes the source data (plaintext) and a secret key, and produces an unreadable set of bytes (ciphertext) as output. Without the right key, decrypting the message in any reasonable amount of time is impossible — not because the data is "hidden," but because trying every possible key with modern computers would take longer than the universe has existed. There are two main approaches to how that key gets used.

Symmetric encryption

The same key is used both to encrypt and to decrypt. This is fast and computationally cheap — symmetric algorithms (such as AES or ChaCha20) are exactly what encrypt the bulk of data in HTTPS connections and VPN tunnels. Symmetric encryption has one complication: both sides need some way to safely agree on the same key without sending it in the clear.

Asymmetric encryption

Here a pair of keys is used — a public one and a private one. Data encrypted with the public key can only be decrypted by the holder of the private key. Asymmetric encryption is slower, so in practice it isn't used for all traffic, but rather to securely exchange a symmetric key at the start of the connection — after which both sides switch to fast symmetric encryption.

HTTPS and TLS: the encryption you use every day

The lock icon next to a website's address in your browser means the connection is protected by TLS (Transport Layer Security) — the protocol that turns HTTP into HTTPS. On connecting, the browser and server perform a "handshake": the server presents a digital certificate, both sides agree on a shared symmetric key via asymmetric cryptography, and from then on all data — from the page text to a typed password — is encrypted with that key. According to the TLS 1.3 specification (RFC 8446), the current version of the protocol cut the handshake down to a single round trip instead of two, and encrypted part of the certificate negotiation, reducing the amount of information visible to an observer on the packet's path. One important caveat: TLS encrypts the content of a request, but doesn't always fully hide the fact that you're contacting a particular domain — the site's address at the DNS-request or SNI level can be visible at intermediate nodes if it isn't separately protected.

Encryption in a VPN tunnel: one more layer of protection

A VPN adds a separate layer: instead of every app negotiating encryption with every server on its own, the whole device creates one encrypted tunnel to the VPN server, and traffic travels onward from there. Modern protocols like WireGuard (the basis for AmneziaWG, used in HamikVPN) use a fixed set of modern cryptography: ChaCha20 encryption paired with the Poly1305 authentication code, Curve25519-based key exchange, and BLAKE2s hashing. According to the protocol's official documentation, a narrow, non-negotiable set of algorithms is a deliberate design choice: it reduces the risk of configuration mistakes and shrinks the amount of code — and therefore the attack surface — compared to protocols that support dozens of cipher combinations.

An encrypted VPN tunnel is especially useful where you don't control the network itself — for example, on public Wi-Fi in a café or airport. For more on the risks of such networks and how to reduce them, see our article on protecting your data on public Wi-Fi.

What encryption doesn't do

It's important to understand the limits: encryption protects the content of your traffic from interception and tampering along the way, but it doesn't turn you into an anonymous user. A service you connect to directly still sees that you contacted it, and knows everything you did in your account once you're logged in. Encryption doesn't protect against phishing, malicious apps on the device itself, or you typing your data into a fake site. It's one layer of protection, not the only one — alongside it, system updates, sensible app permissions and basic digital hygiene matter too.

How to check that your traffic is actually protected

• Check the lock icon in the address bar. If a site opens over HTTP without the "s" and the browser explicitly warns of an unsecured connection, don't enter passwords or card details there.
• See whether the VPN tunnel is active. Mobile apps usually have a clear connection indicator; if the connection drops, traffic goes out without the extra layer of encryption until you reconnect.
• Turn off auto-connect to open Wi-Fi networks in your phone's settings — it takes a couple of minutes in the Wi-Fi section and protects you from accidentally joining a fake access point.
• Keep apps and the system updated. Vulnerabilities in an encryption implementation are fixed by updates, not by swapping the algorithm.
• Use a separate, long password for important accounts. Channel encryption won't help if the key to the account itself is trivial to guess.

If you're choosing a service to encrypt traffic on your phone or laptop, look not just at speed but also at which protocol it uses and how connection logs are handled — the criteria are covered in how to choose a privacy service. HamikVPN, for example, encrypts the connection using a protocol based on AmneziaWG and offers ready-made apps for the major platforms — install them from the download page.