active_hashcash
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Protect Rails applications against bots and brute force attacks without annoying humans.
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active_hashcash issues
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Reimplementing the hashing algorithm in JavaScript (see [`Hashcash.sha1`](https://github.com/BaseSecrete/active_hashcash/blob/9202c286b722a1a9103f71145b6b95fee27633df/lib/hashcash.js#L114)) renders this library vulnerable to one specific attack: An attacker could fork this library and use a faster implementation of SHA1 and...