Introduction
Virtual Private Networks (VPNs) are essential tools for keeping internet connections secure and private. There are several types of VPN, each with its own characteristics, strengths and weaknesses. In this article we compare three popular options: Zscaler VPN, SSL VPN and OpenVPN.
Zscaler VPN
Zscaler Private Access (ZPA) is a cloud-based, zero-trust solution that provides secure connections between devices and sensitive applications. ZPA removes the need for a traditional VPN, offering granular access control and visibility of users and resources. It does, however, require fast internet connectivity, and pricing information is not readily available.
ZPA delivers excellent security features, but performance can suffer due to the limited availability of points of presence (PoPs) and its reliance on the public internet. It offers centralised policy management and integrates with popular identity and access management solutions. The interface is user-friendly and includes diagnostic features. Pricing depends on a range of factors, and several editions are available. Overall, ZPA is a solid option for network security, but it calls for a careful assessment of your specific needs and costs.
SSL VPN
SSL VPN uses the SSL protocol to provide a secure connection between remote users and internal network resources. It requires no client software and can be used directly from a web browser. SSL VPN is easy for end users to work with and enables secure HTTP traffic.
There are, however, security risks associated with SSL VPN: exposure of user credentials, the spread of viruses from remote computers, split tunnelling, missing host security software on public machines, physical access to shared computers, keyloggers, and the loss of confidential information and intellectual property. Countermeasures include strong user authentication, host identity verification, host security posture validation, secure desktops, cache cleaning, keylogger detection, and user education and security awareness.
OpenVPN
OpenVPN is an open-source VPN solution that combines flexibility with strong security. Its security is built on the OpenSSL library and the SSLv3/TLSv1 protocols, offering robust cryptographic algorithms, multiple authentication methods and a high degree of configurability. Like Zscaler, OpenVPN provides granular access control and visibility of users and resources. Unlike Zscaler and SSL VPN, it requires client software to be installed — but in return it offers far greater flexibility and customisation.
SSL VPN vs OpenVPN vs Zscaler: the comparison
Comparing the features, benefits and drawbacks of Zscaler VPN, SSL VPN and OpenVPN: Zscaler offers excellent security features and centralised policy management, but comes with performance and availability limitations. SSL VPN is easy to use and requires no client software, but carries security risks that need to be mitigated. OpenVPN provides strong security and great flexibility, but requires client software and a degree of technical expertise to configure.
Conclusions from the comparison
In summary, Zscaler VPN, SSL VPN and OpenVPN each offer distinct features and benefits that can suit different business needs. Each also has drawbacks worth weighing up. Before choosing a VPN solution, assess your specific requirements and resources. Whichever option you pick, secure and private connectivity should always remain a priority.
Frequently asked questions (FAQ) about VPN tools
What is a VPN?
A VPN (Virtual Private Network) is a technology that creates secure, encrypted connections over public networks such as the internet.
What is Zscaler VPN?
Zscaler VPN, known as Zscaler Private Access (ZPA), is a cloud-based zero-trust solution that provides secure connections between devices and sensitive applications.
How does SSL VPN work?
SSL VPN uses the Secure Sockets Layer (SSL) protocol to provide a secure connection between remote users and internal network resources.
What is OpenVPN?
OpenVPN is an open-source VPN solution offering flexibility and strong security, built on the OpenSSL library and the SSLv3/TLSv1 protocols.
Is OpenVPN secure?
Yes — OpenVPN is regarded as one of the most secure VPN solutions. It offers strong cryptographic algorithms, multiple authentication methods and a high level of configurability.
Which VPN solution is right for me?
The choice depends on factors such as your security needs, ease of use, cost and other specific requirements. Zscaler VPN, SSL VPN and OpenVPN each have unique characteristics, strengths and weaknesses to take into account.