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All because of the compactness of digital data, information can be sent over such a considerable distance in a relatively short amount of time. In the case of fiber-optic cable of course, this works due to the enormous bandwidth in the cables. In the case of wireless cable, the digital information is encoded on radio waves and sent across the air, which is just as fast but still has some physical limitations due to the electromagnetic spectrum.
Cryptography is a means of encoding and decoding information on digital signals, and essentially that means using algorithms and keys to obscure and unbreak the digital signals which are sent along with digital information. When information is encrypted, it is usually encrypted with a key which is usually a large number.
Decryption is the reverse of encryption – if you know someone else's key, you can decrypt the messages that were encrypted with that key, andfigure out what they were encrypted with. But if the messages are being sent digitally, such as through radio waves, you have a problem because you can't hard-wire anybody else's key into the signal along with the bits of information. Cryptography is a way of dealing
The NSA created the RSA algorithm and key system to encrypt communications between themselves and therefore prevent anyone else from eavesdropping on their communications. They also created the DSA algorithm to encrypt their various documents and their encryption key. And, of course, they also have the golden key to decrypt any encrypted communications of their own, allowing them to read them as they please.
Another option is the Oplink CE200, which has several LAN interfaces (10/100/1000baseT), as well as an activity monitor that you can configure to e-mail you when your network usage passes some specified threshold. d2c66b5586