Netgear FWAG114 FWAG114 Reference Manual - Page 169

Reference Manual for the ProSafe Dual Band Wireless VPN Firewall FWAG114 • Confidentiality: Conceals the message content through encryption. IPSec Components IPSec contains the following elements: • Encapsulating Security Payload (ESP): Provides confidentiality, authentication, and integrity. • Authentication Header (AH): Provides authentication and integrity. • Internet Key Exchange (IKE): Provides key management and Security Association (SA) management. Encapsulating Security Payload (ESP) ESP provides authentication, integrity, and confidentiality, which protect against data tampering and, most importantly, provide message content protection. IPSec provides an open framework for implementing industry standard algorithms, such as SHA and MD5. The algorithms IPSec uses produce a unique and unforgeable identifier for each packet, which is a data equivalent of a fingerprint. This fingerprint allows the device to determine if a packet has been tampered with. Furthermore, packets that are not authenticated are discarded and not delivered to the intended receiver. ESP also provides all encryption services in IPSec. Encryption translates a readable message into an unreadable format to hide the message content. The opposite process, called decryption, translates the message content from an unreadable format to a readable message. Encryption/ decryption allows only the sender and the authorized receiver to read the data. In addition, ESP has an option to perform authentication, called ESP authentication. Using ESP authentication, ESP provides authentication and integrity for the payload and not for the IP header. Virtual Private Networking E-3