IPSec provides IP network-layer encryption. The standards define several new packet formats: the authentication header (AH) to provide data integrity and the encapsulating security payload (ESP) to provide confidentiality and data integrity. Key management and security associations, the IPSec parameters between two devices, are negotiated with the Internet Key Exchange (IKE, formerly known as the Internet Security Association Key Management Protocol or ISAKMP/Oakley). IKE can use digital certificates for device authentication to enable the creation of large encryption networks. Without digital certificate support, IPSec solutions will not scale to the Internet. Cisco now offers IPSec in both the Cisco IOS software and the PIX Firewall. Cisco is also working with industry partners to ensure that IPSec is available on a wide range of systems, including Windows NT, Windows 95, and UNIX.
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