Comment by mfoy_

6 years ago

According to KeePass2, the password: "12" contains 7 bits of entropy, but "1234" only contains 5 bits of entropy.

Is that right?

6 comments

mfoy_

Reply
gruez  6 years ago

I wouldn't trust it. If you use the "Hex key - 128-bit" preset, it returns a different amount of bits every time you click it. Here are 3 samples:

    3f38ba8a6ce3aa800f007c2e431df7fd  124 bits
    9339bf587ee11b12d207df846a879cf4  129 bits
    8ca4354a9038df590fecec1f964062fd  121 bits

  • heeen2  6 years ago

    Due to missing or repeated characters from the set of the hex alphabet?

    • gruez  6 years ago

      which doesn't make sense.

      I randomly generated an 8 character alphabetical (all lower case) password "jraxxhwr". According to keepass it has 32 bits of entropy, but the entropy should be 26^8 = 37.6 bits because the search space is all 8 character letter permutations. There's no way you can reduce the search space from 37.6 bits to 32 bits unless you have an oracle that says which characters I used.

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