AMX NXT-CV10 Especificações descarregar pdf (Página 195)

Appendix B - Wireless Technology

183

10" Modero Touch Panels

To resolve problems with WEP, the Wi-Fi Alliance released WPA (FIG. 115) which integrated 802.1x, TKIP

and MIC. Within the WPA specifications the RC4 cipher engine was maintained from WEP. RC4 is widely

used in SSL (Secure Socket Layer) to protect internet traffic.

WPA2

Also know as IEEE 802.11i, is an amendment to the 802.11 standard specifying security mechanisms for

wireless networks. The 802.11i scheme makes use of the Advanced Encryption Standard (AES) block cipher;

WEP and WPA use the RC4 stream cipher.

The 802.11i architecture contains the following components: 802.1X for authentication (entailing the use of

EAP and an authentication server), RSN for keeping track of associations, and AES-based CCMP to provide

confidentiality, integrity and origin authentication.

WPA2 implements the full standard, but will not work with some older network cards. Both provide good

security, with two significant issues:

either WPA or WPA2 must be enabled and chosen in preference to WEP. WEP is usually presented

as the first security choice in most installation instructions.

in the "Personal" mode, the most likely choice for homes and small offices, a passphrase is required

that, for full security, must be longer than the typical 6 to 8 character passwords users are taught to

employ.

With the RC4 released to the general public the IEEE implemented the Advanced Encryption Standard (AES)

as the cipher engine for 802.11i, which the Wi-Fi Alliance has branded as WPA2.

FIG. 115 WPA Overview

FIG. 116 WPA2 Overview

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AMX NXT-CV10 Especificações Página 195