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why is longer password a better security mechanism than a better encryption?

why is longer password a better security mechanism than a better encryption?
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Longer password, when especially coupled with alpha-numerics and special characters are difficult to crack. This is so because, in today’s cyber market, there exists tools for cracking the passwords in various ways. One of the ways to crack the same is by making the software try with sets of keys all possible combinations until it cracks the password. Complicated passwords are usually kept shorter by the users and hence, for a software or attack like that of a Brute-force, to attempt combination of all possible keys, becomes easier and lesser time-consuming affair whereas when the password is longer, it becomes difficult and takes longer time to experiment with all possible combination of keys, hence proven to be a better security mechanism. The password entropy increases considerably well with longer password. This gives rise to more uncertainty in the combinations of the keys to crack the same.

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