IKEv2 stands for Internet key exchange version two, and IPSec refers to the Internet protocol security suite. Together, they form a VPN protocol. A VPN protocol, or a “tunneling protocol,” is the set of instructions your device uses to negotiate the secure encrypted connection that forms the network between your computer and another.
IKEv2/IPSec uses a Diffie–Hellman key exchange, has no known vulnerabilities, allows Perfect Forward Secrecy, and supports fast VPN connections.
IKEv2/IPSec, due to its speed and security, is one of the most widely used VPN software solutions. Proton VPN uses an open-source version of IKEv2/IPSec. You can read more about how IKEv2/IPSec compares to other VPN protocols on our blog post, Which VPN protocol is the best?
The Proton VPN iOS, and macOS applications use IKEv2 to create the encrypted VPN tunnel and keep your Internet activity private and secure.