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A hash algorithm is a function which takes a variable size input and produces a fixed size output. The algorithm tries to make it difficult to predict the output for a given input, find two inputs with the same output, or reconstruct the input from the output.
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Crack hashed passwords using a known password
It is common in development to just update the hash to an arbitrary password's hash.
At the root of the problem is that you (or your legacy system) is not tracking password age or changes. …
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Can one tell if a password guess was close by the hash result?
Yes you can, but you have to store hashes for the near misses as well as associate them, so work and resources and possible security issue here and there. It is possible for instance even now to see t …
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What's the point of hashing a password and then sending it to the server?
Where this falls over is that storing a hash digest where people have access to both the digest and the hash algorithm becomes a risk. …
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Are credit card number look ups more secure with a hash function than with a deterministic e...
Checking and input card number against a hash is odd. Is it being used as a defacto password? Or is the decrypted value being checked against the hash ? … The only other reason to hash is to level an index, which otherwise would have an almighty great hotspot on each of the BINs, cardinality of the following digits aside. …