How VPN Encryption Actually Works
"Encryption" gets thrown around as a single marketing word, but a VPN connection is really built from a handshake, a cipher and a protocol working together. Here's what each part actually does.
The handshake: agreeing on a shared secret
Before any of your data moves, your device and the VPN server perform a key exchange -- a cryptographic handshake that lets both sides agree on a shared secret key without ever transmitting that key in a form an eavesdropper could use. Modern protocols like WireGuard use Curve25519 for this step specifically because it's fast and has held up well under public scrutiny.
The cipher: scrambling the actual data
Once a shared key exists, your data gets encrypted with a symmetric cipher -- commonly AES-256 or ChaCha20. Both are considered secure at current computing power; ChaCha20 tends to perform better on devices without dedicated hardware acceleration for AES, which is why it's common on phones.
Why the protocol matters more than the cipher name
Two VPNs can both use "AES-256" and still behave very differently, because the protocol around the cipher determines how connections are established, how obfuscated the traffic looks to network monitoring, and how it behaves when the connection drops. This is why Total Pro VPN focuses on AmneziaWG and VLESS Reality specifically -- both are built to make the encrypted traffic itself harder to fingerprint as "VPN traffic" on networks that actively look for it, not just to encrypt the payload.
What encryption doesn't cover
Encryption protects data in transit between your device and the VPN server. It doesn't protect what happens after that traffic reaches its destination, and it doesn't stop a compromised device or a phished password from exposing your accounts regardless of how strong the tunnel is.
See Total Pro VPN's plans to try AmneziaWG and VLESS Reality yourself.