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How Secure Is Your Wireless Network? Safeguarding Your Wi-Fi LAN by CCNA Lee Barken - CISSP MCP, CPA

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TKIP

TKIP has three main elements to enhance encryption:

  • A per-packet key mixing function

  • An improved Message Integrity Code (MIC) function named Michael

  • An enhanced IV including sequencing rules

Basically, TKIP is an interim fix for WEP, deployed as a simple software/firmware upgrade. A number of design compromises are made in order to maintain backwards compatibility with the large base of existing and deployed hardware in the field. TKIP, however, fixes all of the known vulnerabilities associated with WEP, at the time of this writing.

TKIP in Detail

The client starts off with two keys: a 128-bit encryption key and a 64-bit data integrity key obtained securely during the 802.1x negotiation. The encryption key is called the Temporal Key (TK). ...

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