Aes key length significance/implications?

You should use a key derivation function in particular PBKDF2 is state-of-the-art in obtaining an AES key from a password or PIN.

You should use a key derivation function, in particular PBKDF2 is state-of-the-art in obtaining an AES key from a password or PIN. In particular, PBKDF2 makes more difficult to perform a key search because it: randomizes the key, therefore making precomputed password dictionaries useless; increases the computational cost of testing each candidate password increasing the total time required to find a key. As an additional remark, I would say that 6 digits correspond roughly to 16 bits of password entropy, which are definitely too few.

Increase your password length.

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