Här finns ett program som i vissa lägen verkar kunna få fram originallösenordet:
http://www.passcape.com/wireless_keys_screenshots.htm
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WPA-PSK passwords cannot be decrypted instantly. If you are recovering a WPA-PSK password, you should be aware that Windows does not store the actual password. Instead, it calculates its hash using a strong PBKDF2 algorithm (HMAC SHA1 with 4096 iterations), encrypts the hash using DPAPI and then stores it in the encrypted format. NPRW will try all available combinations for picking a simple WPA-PSK password; therefore, the recovery time increases as the number of WPA-PSK keys found by the program grows. In the final dialog, the failed WPA-PSK passwords will be highlighted in red.
Men det står också att det skall gå med själva hex-nyckeln.
http://www.nirsoft.net/utils/wireless_key.html
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When you type a WPA-PSK key in Windows XP, the characters that you type are automatically converted into a new binary key that contains 32 bytes (64 Hexadecimal digits). This binary key cannot instantly be converted back to the original key that you typed, but you can still use it for connecting the wireless network exactly like the original key.
http://www.passcape.com/wireless_keys_screenshots.htm
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In theory, it is not a mandatory to have a WPA-PSK password to create a new wireless connection. You can enjoy the recovered WPA-PSK hash (or PSK material, see screenshot below). So in most cases there's no need to uncover the original WPA-PSK password at all. To use the PSK hash (instead of WPA-PSK password), copy the recovered PSK material to the Windows clipboard. Its length must be 64 characters. Open 'Control Panel' and then run 'Wireless Network Setup Wizard'. Select the 'Setup a new wireless network' option and then 'Manually assign a network key'. Now paste the key you have copied to clipboard into the appropriate edit box (actually there are two fields: one for the key and another one just for confirmation).