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How can I encrypt a string with MD5 in Rails 3.0 ? pass = MD5.hexdigest(pass) in a model yields uninitialized constant MyModel::MD5
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The MD5 hashing algorithm uses a complex mathematical formula to create a hash. It converts data into blocks of specific sizes and manipulates that data a number of times. While this is happening, the algorithm adds a unique value into the calculation and converts the result into a small signature or hash.
An MD5 hash is created by taking a string of an any length and encoding it into a 128-bit fingerprint. Encoding the same string using the MD5 algorithm will always result in the same 128-bit hash output.
Unfortunately, MD5 has been cryptographically broken and considered insecure. For this reason, it should not be used for anything. Instead, developers should switch to the Secure Hash Algorithm or a Symmetric Cryptographic Algorithm.
In 2004, researchers revealed a number of weaknesses in regularly-used hash functions. Later in 2005, MD5 was declared "broken" by security expert Bruce Schneier.
You can use Digest::MD5 from the Ruby standard library for this.
irb(main):001:0> require 'digest/md5' => true irb(main):002:0> Digest::MD5.hexdigest('foobar') => "3858f62230ac3c915f300c664312c63f" And one more thing: MD5 is a hash algorithm. You don't "encrypt" anything with a hash algorithm.
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