IPSec
IPSEC: IP-level Security Protocol
- Encryption takes place between the transport and internet layers
- Designed to provide privacy, forgery detection, or both for IP packets
- Uses a security parameter index (SPI) to negotiate cryptographic and authentication algorithms
- Authentication header (AH) and encapsulating security payload (ESP)
RFC 1825, 1826, 1827 and work in IPSec working group Internet drafts