title: Vigenere cipher with full ASCII table
body: <p>I have an assignment in which I have to decrypt a text file encrypted with the Vigenere cipher. However, the alphabet used is the entire ASCII table (256 different characters), and I haven't found any material on how to deduce the key for this alphabet (as all material I've found assumes only a limited alphabet is used). Does anybody know how I should approach this problem? An explanation of good algorithms would be appreciated.</p>