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What Is VPN Encryption?
To ensure that your VPN is secure, limiting user access is only one piece of the equation; once the user is authenticated, the data itself needs to be protected as well. Without a mechanism to provide data privacy, information flowing through the channel will be transmitted in clear text, which can easily be viewed or stolen with a packet sniffer. Most modern VPNs use some kind of cryptosystem, in order to scramble data into cipher text, which is then decrypted into readable text by the recipient.
The type of encryption available is highly varied. However, there are two basic cryptographic systems: symmetric and asymmetric. Symmetric cryptography tends to be much faster to deploy, and are commonly used to exchange large packets of data between two parties who know each other, and use the same private key to access the data.
Asymmetric systems are far more complex and require a pair of mathematically related keys - one public and one private - in order to be accessed. This method is often used for smaller, more sensitive packets of data, or during the authentication process.
