The VPN authentication protocol that uses SSL is Secure Socket Tunneling Protocol (SSTP).
SSTP is a VPN (Virtual Private Network) protocol that creates a secure connection by tunneling PPP (Point-to-Point Protocol) or L2TP (Layer Two Tunneling Protocol) traffic through an SSL/TLS channel. This means SSTP leverages the same encryption technology used to secure HTTPS websites, providing a robust and reliable VPN connection.
How SSTP Uses SSL/TLS
- Encryption: SSTP encapsulates VPN traffic within an SSL/TLS connection, encrypting all data transmitted between the VPN client and server. This encryption protects the data from eavesdropping and tampering.
- Authentication: SSL/TLS provides server authentication, ensuring the client connects to a legitimate VPN server and not a malicious imposter. Client authentication can also be implemented using certificates or other methods.
- Port 443: By default, SSTP operates over port 443, the same port used by HTTPS. This makes SSTP traffic appear similar to regular web traffic, helping it bypass firewalls and network restrictions that might block other VPN protocols.
Benefits of Using SSL/TLS
- Strong Encryption: SSL/TLS employs strong cryptographic algorithms, making it difficult for unauthorized parties to decrypt the VPN traffic.
- Firewall Compatibility: SSL/TLS operates over port 443, enhancing the protocol's ability to bypass firewalls and network restrictions.
- Wide Support: SSL/TLS is a widely supported and well-understood technology, facilitating easy integration and management.
SSTP vs. Other VPN Protocols
While other VPN protocols like PPTP, L2TP/IPsec, and OpenVPN exist, SSTP distinguishes itself through its reliance on SSL/TLS for encryption and transport. PPTP uses weaker encryption methods, while L2TP/IPsec relies on IPsec for encryption. OpenVPN can be configured to use SSL/TLS or other encryption methods.
In summary, Secure Socket Tunneling Protocol (SSTP) is the VPN authentication protocol that explicitly uses SSL/TLS for its secure connection. This allows for robust encryption, authentication, and firewall compatibility, making it a reliable choice for VPN communication.
