What Process Is Used to Protect Transmitted Data in a VPN?

What Is a VPN Tunnel?

A VPN tunnel is a set of technologies that encapsulate your data as it travels from your device to the VPN server of your choice. You can think of it as a private gateway.

Without a VPN tunnel, your incoming and outgoing Web data is exposed on the Internet. All the data that your device transmits is tied to your IP address. That’s how your ISP (Internet service provider) and third-party websites can track what you do online. That’s also how websites can know your precise location, targeting you with personalized ads.


If youre just getting started with VPN services, its crucial to understand the basics of the technologies that power them. First, check our guide to the basics of VPNs. And then learn how VPNs actually work.

VPNs and their Role

A virtual private network or a VPN is an Internet security service. It allows its users to ensure secure access even when connected to the private network. VPNs employ strong encryption techniques to protect the network and ensure a secure connection in the network where loopholes exist.

VPNs play a vital role in protecting corporate data and ensuring controlled access. Authorized access makes sure that no unauthorized entity is trying to access your data. VPNs ensure the built-in capability of protecting the entire infrastructure in such a way that identity and access management (IAM) solutions could be implemented seamlessly.

How VPNs Protect Transmitted data?

VPNs are virtual. They are used by organizations and many remote workers to get connected across the globe. The workers are also given access to the VPN of the organization to utilize the company resources to perform certain tasks. However, the approach is necessary but it is prone to many problems that can lead to high-scale data breaches and cyberattacks. To ensure controlled access to confidential data, VPNs employ the following processes that help secure the network from attacks.


VPN is an abbreviation for “Virtual Private Network”, which means “virtual private line”. You can set up a virtual leased line on the Internet and exchange data using a secure security route. The is like realizing a private network on a public network called the Internet. By using a VPN, you can protect your information from threats such as data eavesdropping and tampering.

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There are two main methods for building a VPN: “Internet VPN” and “IP-VPN”.

Internet VPN uses a general internet line. It can be built at a low cost by using the existing network, the Internet. Internet VPNs can also be further divided into several types.

IPsec is an abbreviation for IP Security Architecture. It is a technology or mechanism that encrypts for secure communication on the Internet. Even if the communication content is eavesdropped on, it is encrypted, ensuring security without decrypting the content.

It is a method to protect the communication contents by encrypting like IPsec. The difference from IPsec is that IPsec-VPN is implemented at the network layer, while SSL-VPN is implemented at the session layer. Therefore, IPsec can be used without depending on higher-level application protocols such as HTTP and SMTP.

On the other hand, SSL-VPN needs to support SSL for each application such as HTTP and POP. HTTPS for HTTP, POP over SSL for POP, etc.

In order to install IPsec-VPN, it is necessary to install the same dedicated software for the recipient and the sender. Once the environment is set up, you can communicate at a relatively high speed. With SSL-VPN, if you use an application that supports SSL, you do not need to install new software for SSL-VPN. For this reason, the burden at the time of installation can be minimized, but the speed is slower than IPsec because it goes through a compatible application.

Formally, it is called “L2TP over IPsec VPN”. L2TP stands for “Layer 2 Tunneling Protocol”. A tunneling protocol realizes a VPN connection between networks. L2TP itself does not have an encryption mechanism, but when used in combination with IPsec, it encrypts the communication content and ensures the confidentiality and integrity of the data.

PPTP (Point-to-Point Tunneling Protocol) is also one of the methods for building a VPN. The difference between PPTP and IPsec is the number of tunnels used to send and receive data. In PPTP, both transmission and reception are performed in one VPN tunnel, and only one VPN tunnel is created. On the other hand, IPsec creates separate tunnels for transmission and reception. PPTP has been advocated by Microsoft, so it has a high affinity with Windows and you can easily build a VPN.

Another type of VPN is IP-VPN. IP-VPN is a VPN that uses a closed network prepared by a major telecommunications carrier.

By using a closed network, security is enhanced and there is no risk of information leakage or eavesdropping. Therefore, it is superior to Internet VPN in terms of communication speed stability and security.

IP-VPN uses a technology called MPLS (Multi-Protocol Label Switching). By adding two types of headers called labels, the data transfer path and network are identified.