Comment # 1 on bug 934261 from Andreas Stieger

I consider the bug not valid as filed: The PSK is not encoded, it is simply
stored. 

If it was, it would simply be an obfuscation. Privilege separation between root
and regular users is possible, alas you are running the tool as root.

If you are referring to secure password storage (which then requires another
password) using KWallet or GNOME Keyring, I believe NetworkManager has support
for it, wicked (in 13.2) not.