RSN(Robust Secure Network)

本文详细介绍了RSN(Robust Secure Network)协议,该协议用于在802.11无线网络中建立安全通信。文中解释了RSN的工作流程,包括无线NIC发送探测请求、接入点响应及认证过程等。此外,还介绍了RSN信息元素帧的格式以及支持的身份验证和密钥管理套件。

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What is RSN (Robust Secure Network)?

RSN (Robust Secure Network) is a protocol for establishing secure communications over an 802.11 wireless network.

RSN (Robust Secure Network) is part of the 802.11i standard.

The RSN Protocol Process

The RSN protocol functions as follows:

  1. The wireless NIC sends a Probe Request.
  2. The wireless access point sends a Probe Response with an RSN Information Exchange (IE) frame.
  3. The wireless NIC requests authentication via one of the approved methods.
  4. The wireless access point provides authentication for the wireless NIC.
  5. The wireless NIC sends an Association Request with an RSN Information Exchange (IE) frame.
  6. The wireless access point send an Association Response.

The RSN Information Element

RSN begins to establish a secure communication channel by broadcasting an RSN Information Element message across the wireless network.

The RSN Information Element (IE) broadcasts the following information:

  • All enabled authentication suites
  • All enabled unicast cipher suites
  • Multicast cipher suite

The format of the RSN Information Element frame is:

Field

Length in octets

Element ID

1

Element Length

1

Version

2

Group key suite

4

Pairwise suite count

2

Pairwise suite list

4 per pairwise suite

Authentication suite count

2

Authentication suite list

4 per authentication suite

Capabilities

2

RSN Authentication and Key Management Suites

The authentication and key management suites supported by RSN include:

Code

Meaning

00:00:00:1

802.1X authentication and key management

00:00:00:2

No authentication; 802.1X key management

RSN Cipher Suites

The pairwise or group cipher suites supported by RSN include:

Code

Meaning

00:00:00:1

WEP

00:00:00:2

TKIP

00:00:00:3

WRAP

00:00:00:4

CCMP

00:00:00:5

WEP-104

RSN on Legacy Wireless Hardware

Wireless networks which employ RSN but allow the use of TKIP are sometimes referred to by the term Transition Security Network (TSN).

TSN is necessary because legacy wireless equipment does not have the necessary hardware to support the CCMP protocol.

 

http://www.tech-faq.com/rsn-robust-secure-network.shtml

 

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