Need to crack passwords? Rainbowtables!

Passwords are usually not maintained in plain text but as a hashed value. Even having those hash values does not allow you to find the plaintext password it was generated from easily. The only way would be a brute-force attack, generating hashvalues from a very large number of plaintext words (e.g. from a dictionary) until the outcome matches the known. Generating billions of hashvalue takes very long, so another way to do it faster is to create all the hashvalues in advance and store them in a database called rainbowtable. Everytime you need to crack a password, you can just look the hashvalue up in the table. Find the exact article and tools here.
Download of precompiled rainbowtables here.

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