These are wireless bidirectional RS-232 devices originally sold with Lap-Link Wireless. They are occasionally now found on Ebay. They have three selectable channels, operate at 900MHz, and transmit up to 115Kbps. They are short range, only about 30 feet, but one might try modifying them for additional range. They require a particular a particular control line toggled in order to activate, but I forget which one. Some patient work should get them figured out.
Suppose I send you an encrypted email with a suspicious looking subject. I don't give you the key. The police come knocking at your door. You've done nothing wrong, but if you can't prove that, you go to jail. How do you prove you _don't_ have the key? Presumably, the law is meant for situations where there is a bi-directional conversation between two people using encrypted messages. Such a conversation can't occure if neither party has the decryption keys. In the real world, however, laws that can be abused generally are abused, and if this law does not require such strong evidence that the suspect has the decryption key, then there _will_ be cases like the one above.
The person in possession of a safe or safe-deposit box can reasonably be expected to have some means of accessing it. Encrypted messages, on the other hand, are comparable to having someone else drop a safe on your doorstep. This law assumes that you know whoever left the safe and that they gave you the key. If you don't know that person and you were given no key, how do you prove it?
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RC Car using AirShare
Suppose I send you an encrypted email with a suspicious looking subject. I don't give you the key. The police come knocking at your door. You've done nothing wrong, but if you can't prove that, you go to jail. How do you prove you _don't_ have the key? Presumably, the law is meant for situations where there is a bi-directional conversation between two people using encrypted messages. Such a conversation can't occure if neither party has the decryption keys. In the real world, however, laws that can be abused generally are abused, and if this law does not require such strong evidence that the suspect has the decryption key, then there _will_ be cases like the one above.
The person in possession of a safe or safe-deposit box can reasonably be expected to have some means of accessing it. Encrypted messages, on the other hand, are comparable to having someone else drop a safe on your doorstep. This law assumes that you know whoever left the safe and that they gave you the key. If you don't know that person and you were given no key, how do you prove it?