WEP implementation using Linear Feedback Shift Register (LFSR) and dynamic key

The WEP (wired equivalent privacy) is an IEEE 802.11's optional stream cipher scheme implemented in its MAC layer for confidentiality of the data frames. It uses RC4 for pn-sequence generation and the same is xored with the plain text and added integrity check value produced by the CRC-32. In this paper, the WEP has been implemented using the Linear Feedback Shift Register (LFSR) as a pn-sequence generator, i.e., the RC4 in WEP has been replaced by LFSR. Also the static key used in WEP is replaced by a dynamic key; as a result the proposed WEP implementation is more secured than the original one. The pn-sequence generated by LFSR is more random than the pn-sequence generated by RC4. In this regard, a randomness test, called Diehard test, has been carried out on the outputs of both RC4 and LFSR, and it has been found that more tests are satisfied by the LFSR, the details test results are included in this paper for ready reference.