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Which is the best solution to implement for protecting against intercepted password?
One-time password
PPTP
Use complex password
L2TP
A one-time password is only valid for one use, reducing the likelihood that an intercepted password will remain valid. Based on question complex password is a great solution. Otherwise everybody need to immediately stop using password more than one.
The question asks for the best protection against intercepted password. A complex password will not protect if that password gets intercepted. Only reduce the likelihood it will be cracked. L2TP does not encrypt, so is no use. PPTP encrypts data in motion, so reduces the likelihood of a password being intercepted, but does not protect once the password has been intercepted. OTP's protect against intercepted passwords, because the password, if intercepted, can only be used once.
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