![]() Rainbow tables take less computation power and time, but much more storage (often terabytes in size).Īnd because modern GPUs can attempt billions of unsalted candidate passwords per second, rainbow tables are only more useful than GPU-based attacks in a very specific and constrained set of circumstances: ![]() Cracking takes more computation power and time, but less storage. This is the classic "time/memory trade-off" concept. If a matching hash is not already present in the rainbow table, the plaintext cannot be discovered with that table. Rainbow tables compare a given hash to a large (but finite) list of precomputed hashes. If no candidate plaintext produces a match, then the original plaintext has not been discovered and the hash has not been "cracked". ![]() Password-cracking software like JtR dynamically performs hashing of large lists of candidate plaintexts until a plaintext is found that produces a hash that matches the target hash. They solve the same problem, but in opposite directions:
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