Hash functions are not particularly vulnerable to attack. However, brute force is one way to attempt to attack hash functions. The greater the length of the hash value, the longer the amount of time that is required to break the hash, often making brute force an ineffective attack method.
A more effective way to attack hash functions is to use rainbow tables, which offer a shortcut to breaking the hash.
However, creating rainbow tables for each hash function (Message-Digest Algorithm 5 [MD5], SHA1, SHA-256) takes a considerable amount of time and space. Rainbow tables that have both upper and lower cases of alphanumeric characters, including special characters, can range from a few hundred gigabytes (GBs) to a few terabytes (TBs).
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