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Part 1 of this series looking at the Vigenère cipher covered crerating a Vigenère Square. In this second part we look at using the square to encipher messages, and implementing that method in Javascript.
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The Vigenère cipher dates from the sixteenth century, and resisted deciphering for three centuries. In Part One we look at this ancient cipher, build a data model to represent Vigenère square and use it to display a version in the browser.
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A Byte Order Mark (BOM) can appear at the start of a file to indicate Unicode encoding, which version of Unicode (8, 16, 32) and the endedness (See Byte Order Mark). UTF-8 doesn't require a BOM (since endedness is not an issue for 8-bit encoding), but the presence of a BOM can interfere with code that's not expecting it. Here are some techniques for removing it.