Using this, the salt, the password, and some intermediate hash values are run through the hash function multiple times to increase the computation time required to hash each password. This ensures that every password has a unique generated hash and hence, rainbow table attack, which works on the principle that more than one text can have the same hash value, is prevented.Īnother technique that helps prevent precomputation attacks is key stretching. Rainbow table attacks can easily be prevented by using salt techniques, which is a random data that is passed into the hash function along with the plain text.
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