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In pairwise key hierarchy there are two root keys: pre-shared key (PSK) and Authentication, Authorization, and Accounting Key (AAAK). From these two keys pairwise master key (PMK) is derived. In the case of PSK, PMK is equal to PSK. In other case, PMK is obtained by taking the first 256 bits of AAAK. Now, to the question about generating pairwise transient ...

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