Encapsulating Security Payload Header (IPv6 extension header) definition in Computer Security terms:
Definition(s): This header is used to provide confidentiality, data origin authentication, connectionless integrity, an anti-replay service (a form of partial sequence integrity), and limited traffic flow confidentiality. Also known as the IPsec Encapsulating Security Payload header (ESP).
Source(s): NIST SP 800-119
reference: CSRC Glossary