Essay: Wi-Fi Protected Access

Essay: Wi-Fi Protected Access
12/04/2011 Comments Off on Essay: Wi-Fi Protected Access Academic Papers on Information Technology,Sample Academic Papers admin

Sample Essay

In 2003, it was announced by the Wi-Fi Alliance that Wi-Fi Protected Access (WPA) protocol would be replacing the WEP protocol. WEP implements several new technologies which were used to overcome the shortcomings of WEP. These include a new scheduling algorithm called Temporal Key Integrity Protocol (TKIP) and integrity check through Message Integrity Check (MIC) and authentication through EAP. WPA also uses a different seeding technique for RC4 ciphering and also increases the size of Initial Vectors (IV) from 24-bits to 48 bits, thereby reducing the occurrence of duplicate IV’s on the network.

WPA contains a new field called Message Integrity Check (MIC) which uses Michael algorithm to verify the integrity of the data. It is an 8-bit field which placed just before the ICV and also contains a frame counter. The data is then ciphered through the RC4 mechanism, similar to WEP, but it uses a larger IV (48-bits) and a new algorithm, called TKIP, to generate keys for seeding. WEP also has an authentication mechanism for every wireless client that connects to the network, which is implemented through EAP. Once the authentication is successful, the access point creates a new session as well as the new base key, which is produced by hashing together the MAC addresses of the access points and the client, a special private number for the session and random numbers. The base key is then used to generate per-frame keys to ensure that each frame in the WPA network is encrypted with a different key. The rc4 algorithm, on the other hand, is encrypted through the use of S-boxes and non-linear substitution…

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