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Unit 5 - Coggle Diagram
Unit 5
Encryption
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Caesar Cipher
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Reason it worked
There was very little movement at the time, so people didn't know many other languages
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Vernam Cipher
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Uses a one-time pad, each key should only be used for one cipher, so a new key is used each time
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Main problem is that the key cannot be encrypted, so if the key is intercepted, the cipher is easy to decrypt
Sound
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Nyquist Theorem
Suggests to get an accurate recording, the sample rate has to be at least double of the highest frequency in the original sound
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Compression
Lossless
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Run length encoding
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Works by identifying long runs of data and replaces them with the data and a symbol of how many times it is repeated
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