chmac: hash

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  1. http://pajhome.org.uk/crypt/md5/
    A javascript implementation of md5. Very handy.
  2. http://www.hashcash.org/
    Hashcash is an anti-spam technology which requires the sender to compute a partial hash collision (which takes a predictable amount of time) in order to "pay" for their email. On the flipside, it's very easy to verify the hash.
  3. http://www.thenewtownhash.org/
    Hash House Harriers club in Edinburgh

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