ZyXEL Communications P-2612HW-F1 - Specifikace stáhnout pdf (Strana 41)

Wireless Application Notes

Wireless Introduction

WEP Configuration (Wired Equivalent Privacy) Introduction

The 802.11 standard describes the communication that occurs in the wireless

LANs.

The Wired Equivalent Privacy (WEP) algorithm is used to protect wireless

communication from eavesdropping, because the wireless transmissions are easier

to intercept than transmissions over wired networks, and wireless is a shared

medium. Everything that is transmitted or received over a wireless network can be

intercepted.

The WEP relies on a secret key that is shared between a mobile station (e.g. a

laptop with a wireless Ethernet card) and an access point (i.e. a base station). The

secret key is used to encrypt packets before they are transmitted, and an integrity

check is used to ensure that packages are not modified during the transition. The

standard does not discuss how the shared key is established. In practice, most

installations use a single key that is shared between all mobile stations and access

points APs.

The WEP employs the key encryption algorithm, Ron's Code 4 Pseudo Random

Number Generator (RC4 PRNG). The same key is used to encrypt and decrypt the

data.

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ZyXEL Communications P-2612HW-F1 - Specifikace Strana 41