Timeline for WPA/WPA2 Handshake -- A question on the computation of the MIC
Current License: CC BY-SA 3.0
3 events
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| Aug 24, 2016 at 13:19 | comment | added | Michael | In the image, you see that after message 2 is sent by the supplicant, the authenticator 'Calculates PTK using ANonce and SNonce'. Directly thereafter, the authenticator recalculates the MIC that the supplicant has sent in message 2 (not shown in the image, but can be read in the spec). To calculate this MIC, the PTK is required. If the PTK would be different, the MIC calculated by the authenticator would NOT match the MIC calculated by the supplicant. So whereas the PTK is not exchanged, the MIC can be seen as a derivative that was calculated using the PTK. | |
| Aug 24, 2016 at 7:13 | comment | added | Minaj | Its still not so clear. Lets focus on the statement, " ... otherwise the PTK calculated by the AP would be different from the PTK calculated by the supplicant ...", -- How can the sender and AP can know if they computed the same PTK ? They do not exchange the PTK at any time during the exchange. | |
| Aug 24, 2016 at 6:33 | history | answered | Michael | CC BY-SA 3.0 |