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Yes I agree that the encryption can be cracked even with long "passwords". Public keys are all mathmatical algorithms and if you can find the start point you have cracked the code.
Mac addresses are a convenient filter for me because I only need to stop accidental use of my internet by close neighbours who aren't on my net. If I really want to encrypt something I can generate my own exclusive random key that I will defy anyone to crack, but that means I have to pass the key to anyone who needs it which would defeat the object. I spent 25 years in defence cryptography maintaining the machines.
Barry
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