Unformatted text preview: coding so that you’re hiding content but not existence of message o Alice Bob o Alice is the sender, Bob is the recipient o Eve is in the middle (evesdropper)-Transposition: identities of the symbols in a message stay the same, but their positions change o Not good idea if you have a short message (example: andy dyan) o 4 x 3 x 2 x 1 x 4! = 24-Substitution Rail Fence Cipher “Welcome to Lign 17” step 1: # rows = 2 w l o e o I n 7 e c m t l g 1 step 2: wloeoin7ecmtlg1 *this operation scrambled the letters but original ID is still there...
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- Winter '08
- Cryptography, Alice, Rail Fence Cipher, Geovanni porta