- Fox Key Encryption. Periodically change the encryption key will not prevent dangerous because an attacker WEP key can be cracked in a matter of hours. But change the encryption keys would make the threat to the network is not going to last forever. A hacker is always able to crack the encryption key for the second time, but by changing the locks will prevent the hacker. Unfortunately, the key changes will take time for both the AP and all wireless NICs that use the AP must be changed manually. Implementation of these recommendations depends on the value of the security and service time.