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Slap a 256k encryption key on your correspondence, and you'll keep out major corporations and serious governments.
Friends come and go. Enemies accumulate.
For starters, they can beat the key out of you.
Besides, if someone is prepared to beat you over the head to read your mail, then you probably have bigger problems than people reading your mail.
The UK has legislation that allows the police to jail anyone who doesn't supply keys on demand. But if you're really serious about security you can use advanced crypto to hide the fact that you have things to hide.
While the NSA might not be fooled, the local plod may well be.
their conversations could still have been over-heard if enough time, energy, and money had been thrown at the problem.
I think there is a fundamental law of information physics involved in all this. If you want a paper to be secure, you put it in a "secret" folder in a locked file cabinet in a locked room in a locked building. It's a hassle to get at it, but it's pretty secure. If you want to keep your file secure, you encrypt it, you use a good key distribution system, you require complex passwords, and you force people to change their access routine regularly. It's a hassle to get at it, but it's pretty secure. Fundamentally, I propose, the difficulty of access for approved users (you) is a proxy for the fundamental security of the overall system--regardless of the access method, physical or electronic.
She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre
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