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Which technique provides protection against already intercepted passwords?
NIDS
One-time passwords
VPN
ACL
The question refers to what control provides protection to an already intercepted password. Neither NIDS nor ACLs provide any protection for a legitimate user access. VPN prevents interception from happening, but is not offering any protection if interception has already happened. Only "one-time passwords" is correct, because one time passwords can be used only once. Edit: It only provides some protection, if a trojan in your browser intercepts your one time password and use it before you do, then it doesn't help very much. Also the same for phising but is perhaps not intercepting... EDIT: Question does not clearly state "already" as you suggested above, hence added the word. Otherwise, VPN a valid answer
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