Providing a VPNCENTER service is a costly business. There are servers to maintain, software to be developed, people to handle customer support, advertising expenses, to name a few.
All this doesn’t come cheap.
Many free VPN providers have been caught selling customer data, quietly installing malware or injecting advertising. While a free VPN may be tempting, when it comes to choosing this type of service, you have two options. The first is paying a fee. The second is paying with your data by looking at excessive ads or by risking your Internet connection security.
The VPN works by sending your data encrypted through a virtual tunnel and decrypting it on the server side. Using a strong encryption protocol and a long encryption key is essential for keeping your data secure while it travels through the Internet.
Although AES encryption with 256-bit key or more should be standard for any VPN, there are still many services that provide only 128-bit keys. Other strong VPN ciphers to look for are Twofish or Camellia. Look out for Perfect Forward Secrecy as well; not many VPN services provide this essential security feature.