- 密钥层次
80211r的重点是三层密钥模型
WLAN Controller : PMK-R0 key holder (R0KH)
Access Point : PMK-R1 key holder (R1KH)
Client Station : PMK-S0 key holder (S0KH)
Client Station : PMK-S1 key holder (S1KH)
802.11r defines a three-level key hierarcy
1. Pairwise Master Key R0(PMK-R0) : The first level key of the FT key hierarchy. This key is derived from master session key (MSK)
2. Pairwise Master key R1(PMK-R1) : The second level key of the FT key hierarchy.
3. Pairwise Transit Key (PTK) : The third-level key of the FT key hierarchy. The PTK is the final key used to encrypt 802.11 data frames.
PMK-R0属于属于第一层，PMK-R1属于第二层，PMK属于第三层,S0和S1是PMK-R0和PMK-R1在STA上的对应体现。
– 首次连接
– Over-the-Air Fast BSS Transition
– Over-the-DS Fast BSS Transition
带Resource Request，多了一对握手包
参考：
https://www.cwnp.com/uploads/802-11_rsn_ft.pdf