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NE20E-S2 V800R010C10SPC500 Configuration Guide - Security 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - Security
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Overview of IPsec

Overview of IPsec

Based on protocol packet encryption and authentication at the IP layer, Internet Protocol Security (IPsec) ensures the integrity, authenticity, and confidentiality of protocol packets transmitted over networks.

IPSec is an open network-layer framework protocol designed by Internet Engineering Task Force (IETF). It is not a single protocol, but a collection of protocols and services that provide security for IP networks, including security protocols such as Authentication Header (AH) and Encapsulating Security Payload (ESP), Internet Key Exchange (IKE), and certain algorithms used for authentication and encryption.

Before IPv4 was introduced, the Internet scale is small, and Internet security is ensured by physical isolation. Because explosive growth of the Internet was beyond expectation, IPv4 security protection means were not considered during IPv4 design and development.

Because IP does not provide any security, IP addresses are easily forged, contents in IP packets can be tampered with, and packets can be replayed or intercepted in transit. Therefore, the security of the received IP packets cannot be ensured. Application-layer methods resolve the problem, but are effective only on specific applications. Therefore, there is an urgent need in protocols that provide security services on the IP layer. The IPSec technology resolves this problem.

IPSec provides following security services for IP packets mainly through encryption and authentication:
  • User data encryption

    IPSec encrypts user data to ensure data confidentiality.

  • Data integrity authentication

    IPSec ensures that the data is not tampered during transmission using data integrity authentication.

  • Data origin authentication

    IPSec authenticates data origins to ensure that data comes from real senders.

  • Anti-replay

    IPSec prevents malicious users from sending captured packets, that is, the receiver discards duplicate packets.

IPsec has the following advantages:
  • All IP-capable applications and services can use IPsec without being modified.
  • Protocol packet encryption is based on individual protocol packets instead of packet flows, significantly enhancing protocol packet security and protecting against network attacks.
Updated: 2019-01-02

Document ID: EDOC1100055397

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