Analog and Digital Communication Systems - download pdf or read online

By Martin S Roden

Publication by way of Martin S Roden, Roden, Martin S

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The first line contains the plaintext, the second line contains the key, and the third line contains the ciphertext or the output of the XOR operation. 0 1 0 0 0 1 0 1 0 1 0 1 0 0 1 0 0 1 0 0 1 0 0 1 1 1 1 0 1 1 0 1 1 1 1 0 1 1 0 1 1 1 1 0 1 1 0 1 1 0 1 0 1 0 0 0 1 0 1 1 1 1 1 1 1 0 1 0 0 1 0 0 0 1 0 0 0 0 1 1 1 1 1 0 1 1 0 1 1 0 1 0 1 1 1 0 To see how XOR works, try decrypting the message. In the following chart the first line contains the ciphertext, the second line contains the key, and the third line shows the results of performing XOR on the first two lines, which produces the plaintext message.

Because crypto is very hard to do and only a small group of people is very good at building it, think twice when buying security products with proprietary implementation. Good crypto is designed in such a way that, even if you share the inner workings of the algorithm, it is still secure because of the key. Think about padlocks. Lock companies have a patent on their locks. This means that you can get a copy of the patent and see exactly how their locks work. Yet even if you know how their locks work, their locks are still secure.

For that we’ll call on Bob and Alice again. Assume that Alice wants to send Bob an order. Alice wants to make sure that no one can read the order and that it arrives unaltered; Bob wants to be able to prove in a court of law that Alice sent the message. First, Alice takes the message and runs it through a hash to produce a smaller signature for the file. Alice signs the output of the hash with her private key. She then attaches the private key to the original message.

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Analog and Digital Communication Systems by Martin S Roden

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