The Vigenère cypher. It turns up in Lauren Child's Ruby Redfort books, which daughter #2 is reading, and in Red Shift by Alan Garner, which I've just read. So I wrote this little library to help me encrypt and decrypt it. Probably won't be of much interest to anyone: the Vigenère cypher is almost useless for modern cryptography, and I've written it in XSLT, which most programmers seem to hate, but as a linguist I have a perverse liking for it.
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