http://www.rfc-editor.org/rfc/rfc3602.txt
RFC 3602: The AES-CBC Cipher Algorithm and Its Use with IPsec, S. Frankel, R. Glenn, S. Kelly2003-09-01T23:00:00-00:00This document describes the use of the Advanced Encryption Standard (AES) Cipher Algorithm in Cipher Block Chaining (CBC) Mode, with an explicit Initialization Vector (IV), as a confidentiality mechanism within the context of the IPsec Encapsulating Security Payload (ESP).