Which of the following are critical flaws of PIN entry WPS authentication with a hard-coded PIN?
a. The hard-coded PIN can never be reset, so if it is recovered by a hacker it can be reused to recover the new password.
b. There is a one-minute lockout period after three incorrect PIN attempts.
c. It uses an 8 digit pin, which is made of 7 digits and one checksum value, and sends it in two parts. This means it takes a maximum of 11,000 tries to guess the PIN.
d. It allows for the secure exchange of the SSID and the pre-shared key.