CS 472

Assignment #1

Due Midnight, Thursday Sept 24, 2009

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I. file1.cipher is the result of encrypting an English text file1.plain using the simple XOR encyption . The encryption key used is a single upper case word character (A-Z). You are required to reveal the file1.plain and the used encryption key character.

II. file2.cipher is the result of encrypting an English text file2.plain using the simple XOR encyption . You are required to reveal the used encryption key.