Unit installation

18-5

your DTMF tones doesn't know which digits are the decoy digits and which ones are digits 2, 6 and

3 of your password. So even if they decode your DTMF digits as you log on dozens of times, they

probably won't be able to figure out your password.

All you have to do to use method #4 is request to log in ("187 003" for example), figure out what

digits the controller is asking for, then enter 187, some decoy digits, the digits the controller asked

for, and some more decoy digits. You should randomly choose from all of the DTMF digits

(except the force-execution digit which defaults to 'D') for your decoy digits. You can use from 0

up to 8 or so decoy digits before and again after the digits the controller asks for.

Remember that the whole purpose of the decoy digits is to keep someone that is listening and

decoding your tones from figuring out which of the digits you enter are the decoy digits and which

ones are the answer to the challenge. Use different decoy digits each time. Try to enter the decoy

digits at the same rate that you do the other digits.

If all of this password stuff sounds too complicated, remember that using a challenge password

with decoy digits is only needed to deal with extreme security problems. You will probably be just

fine with no passwords and just changing a few of the important command names or with Method

#1 fixed passwords.