Generating large amounts of hashes takes time, so you significantly reduce the time required to crack a password if you have them precomputed. There are two main factors that determine the quality of cryptographic hashing function: 1) Generated hashes are as unique as possible (less likely to generate the same hash for two different passwords) 2) Cant be reversed (there is no way of doing the inverse operation, or to significantly reduce the range of possible plaintexts) To crack a hash, you can either exploit one of its know weakness, or generate the hashes for all the possible passwords and compare them to the password hash you are trying to crack.Ī rainbow table is a precomputed table of hashes with their corresponding passwords in plaintext. Oph Vista Special Nt Hash Table Crack A Hash This way, when the program wants to verify that a given password corresponds to the encrypted password, it generates a hash for the given password and compares it with the stored hash.
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