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Unformatted text preview: “Encoding E with key S” means converting both E and S to numbers (using A=0, B=1,. .., Z=25, so that E=4 and S=18), adding the numbers mod 26 (getting 4+18=22), and converting the result back to a letter (W). • Deciphering means fnding the key letter For each ciphertext letter and subtracting it to get the plaintext letter. Plaintext: ET TU BRUTE Repeated Key: SP QR SPQRS Ciphertext: WH IK TFJJW...
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This note was uploaded on 11/22/2011 for the course COMPSCI 187 taught by Professor Barrington during the Fall '11 term at UMass (Amherst).
 Fall '11
 barrington
 Data Structures

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