04_encryption

04_encryption - CS 6 Topic 4 Encryption In the beginning,...

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Unformatted text preview: CS 6 Topic 4 Encryption In the beginning, there was trust. The Internet was not designed for security. o Information sharing o Resource sharing The Problems Privacy for our eyes only. ID Authentication I am who I say I am. Data Authentication This is what I sent. The Privacy Problem Encryption Encryption is scrambling a message in such a way that it is nonsense to anyone who doesnt know how to unscramble it. This is also known as cryptography . SymmetricKey Like the old Secret Decoder Rings A -> C B D etc. Encode (key = +2): Brian Dtkcp Decode: Dtkcp (key = -2) Brian Single Key Requires sharing the same, prearranged key. Trust! Also, fairly easily broken. Two Keys! PGP Pretty Good Privacy. To send one message, we use two keys, the encoding key, and the decoding key. Encoding Key Decoding Key Two Keys The two keys are different, but like pieces to the same puzzle: They have a unique fit, and you can only decode a message made with one using the other. Sending a message Encoding Key Decoding Key ? ?...
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This note was uploaded on 08/07/2011 for the course CS 006 taught by Professor Gustafson during the Summer '11 term at UC Riverside.

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04_encryption - CS 6 Topic 4 Encryption In the beginning,...

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