Responding to Security Issues in WiMAX Networks

Key Management in Mobile WiMAX Networks

“…The SRA method improves the scalability for ELAPSE and it can also improve the other methods [20,21,23,24] which have similar setups. As mentioned earlier, ELAPSE divides the MSs into N subgroups.…”

“…In [21], the authors proposed an algorithm called Efficient sub-Linear rekeying Algorithm with Perfect Secrecy (ELAPSE) in order to address the problems of MBRA algorithm. Although this method solves the forward and backward secrecy problems, it suffers from some weaknesses in terms of scalability and efficiency.…”

“…It should be highlighted here that basically the methods in [20,21,23,24] are based on ELAPSE in that they all use tree structures, and therefore the problem associated with ELAPSE as highlighted before still remains.…”

“…Here, SG 2 divides into two subgroups i.e. SG 21 and SG 22 . The entire number of MSs in each subgroup is labeled in '#MS' field of Figure 13, when the 12th MS enters into the BS coverage area.…”

“…As a result, the number of subgroups based on log(n,2) should decrease as well. When the number of MS drops to less than 12, SG 21 and SG 22 combine together into one subgroup, i.e. SG 2b .…”