Security (IPSec) Encryption-CHS版 (2)

2008-02-23 04:54:34来源：互联网阅读 ()

An IKE SA is used by IKE only. Unlike the IPSec SA, it is bi-directional.

Secure Hash Algorithm (SHA): A one way hash put forth by NIST. SHA is closely modeled after MD4 and produces a 160-bit digest. Because SHA produces a 160-bit digest, it is more resistant to brute-force attacks than 128-bit hashes (such as MD5), but it is slower.

Transform: A transform describes a security protocol (AH or ESP) with its corresponding algorithms. For example, ESP with the DES cipher algorithm and HMAC-SHA for authentication.

Transport Mode: An encapsulation mode for AH/ESP. Transport Mode encapsulates the upper layer payload (such as Transmission Control Protocol (TCP) or User Datagram Protocol (UDP)) of the original IP datagram. This mode can only be used when the peers are the endpoints of the communication. The contrast of Transport Mode is Tunnel Mode.

Tunnel Mode: Encapsulation of the complete IP Datagram for IPSec. Tunnel Mode is used on order to protect datagrams sourced from or destined to non-IPSec systems (such as in a Virtual Private Network (VPN) scenario).

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