IPsec, short for Internet Protocol Security, is a suite of protocols developed to ensure secure internet communication by protecting data through authentication, encryption, and data integrity.
IPsec is a network layer protocol in the OSI model that can securely protect all applications at higher layers, regardless of the application layer protocol. It functions like a security monitor, verifying each data packet’s credentials prior to transmission over the internet.
IPsec incorporates two main protocols: Encapsulating Security Payload (ESP) and Authentication Header (AH). ESP provides confidentiality, data origin authentication, and connectionless integrity. On the other hand, AH provides connectionless integrity and data origin authentication, but it doesn’t offer confidentiality.