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For one million passwords, it rises to 20 bits, which is considerably shorter than a 128-bit key.
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For example, if our password is generated from a list of 1,024 words, we only have an equivalent key size of 10 bits. This considerable reduces the strength of the key. One of the weakest things about cryptography is that you might have a strong encryption key (such as a 128-bit or 256 bit key), but you create it from a pass phrase, or where you protect it with a password.
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