How VPN Encryption Protects Your Everyday Connection
Learn how encrypted VPN tunnels and HTTPS protect data in transit, and understand the practical difference between AES-128 and AES-256.
What path does data take when connected to a VPN? Understanding the scope of encryption can help you make more appropriate settings for public Wi-Fi, remote work, and everyday browsing. This guide starts with the transmission path, and then explains the encryption algorithm and the details that need to be paid attention to when using it.
A VPN protects tunneled network transmissions. Website HTTPS, device updates, and account verification still have their own protective roles.
01How does a VPN protect data in transit?
After the device is connected to ZoogVPN, traffic passing through the VPN will first reach the VPN server through the encrypted tunnel and then access the target service. Encryption converts directly readable data into something that requires a key to interpret, reducing the risk of others on the same network reading the transmission.
A VPN protects the connection between your device and the server; the website's own HTTPS is still used to protect your communication with the website. Both can work simultaneously and undertake different ranges of protection.
02AES-128 vs. AES-256, what’s the difference?
AES is a symmetric encryption algorithm, 128 and 256 represent the key length. ZoogVPN’s free servers use AES-128, and its Premium servers use AES-256. Longer keys provide greater key space, but day-to-day speeds are also affected by device, protocol, and server distance.
| Compare items | free server | Premium server |
|---|---|---|
| Encryption method | AES-128 | AES-256 |
| AES key length | 128 bits | 256 bit |
| Usage | Connect to servers available for the free plan | Connect to servers available for Premium plans |
| Protected objects | Traffic through VPN tunnel | Traffic through VPN tunnel |
03Encryption, protocols and end-to-end encryption
The VPN protocol determines how the connection is established, verified, and transmitted; algorithms such as AES are responsible for data encryption. Protocols and encryption algorithms such as OpenVPN and IKEv2 belong to different levels, and all connection parameters cannot be determined based on the protocol name alone.
End-to-end encryption typically protects messages between the sender and receiver of a communication. A VPN tunnel terminates at a VPN server, so VPN encryption is not equivalent to end-to-end encryption for chat apps, nor does it replace password and verification settings for website accounts.
04Used in daily scenarios
- When using shared Wi-Fi in hotels, cafes, etc., establish a VPN connection before accessing the service.
- Keep work apps protected by a VPN while working remotely.
- If split tunneling is used, make sure that the applications that need protection are not added to the exclusion list.
- Check the connection status again after your device sleeps, changes Wi-Fi, or switches cellular networks.
05FAQ
Does AES-128 also provide encryption protection?
yes. AES-128 and AES-256 are both AES encryption methods with different key lengths; the free server also transmits corresponding traffic through an encrypted tunnel.
Will a VPN protect all files on my device?
A VPN primarily protects tunneled network transmissions and does not automatically encrypt files on your device's hard drive, nor does it replace file backups and device security settings.
The web page already uses HTTPS, what else do you need to pay attention to?
HTTPS and VPN have different scopes. You should still keep HTTPS when using a VPN, and pay attention to website addresses, account verification, and device updates.