Week 1 Lecture Notes

Week 1 Lecture Notes - Transposition Cipher : keeps the...

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January 9: Lecture 2 Read book, go to lecture, and do assignments to pass class! No need to memorize historical data as long as you concentrate on the methods Secret Writing Steganography (hidden messages): secret communication by hiding messages Wax tablets (covered in wax so looked blank) Tiny silk (Chinese messenger ate it and later delivered it) Invisible ink on eggs Cryptography : not hiding the message itself, but its content
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Unformatted text preview: Transposition Cipher : keeps the identities of the characters, but you change their positions in the message Not good with short messages because not many ways of scrambling the message However, with long messages, many possibilities of scrambling the characters Substitution Cipher : will be went over next lecture Rail Fence Cipher : Shown in the following two pages. January 11: Lecture 3...
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Week 1 Lecture Notes - Transposition Cipher : keeps the...

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