US Robotics USR2450 Technické informace stáhnout pdf (Strana 43)

V 2.2 Copyright SystemExperts 2001,2002,2003

Current Status of WEP (cont)

n Use AES vice RC4

n 802.1X rekey be accepted as normative text

n “WEP2” to be known as “Temporal Key Integrity

Protocol (TKIP)”

V 2.2 Copyright SystemExperts 2001,2002,2003

Current 802.11b Authentication

n Two specified in the standard: Open and Shared

n Open system authentication: This is the default

n any client can associate with the access point

n doesn’t mean the get an IP though

n Shared key authentication: Uses a shared secret key (i.e., the

WEP Key) to authenticate the client to the AP

n client sends an Authentication frame to the AP

n AP replies with an Authentication frame containing a 128bit

challenge

n client will send the “encrypted” challenge back

n AP will decrypt and compare, if it matches, then replies with a

“success” authentication

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US Robotics USR2450 Technické informace Strana 43