Bas

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seen Apr 9 '13 at 18:44

Apr
8
comment Given a certain entrophy per character, how long should a passphrase be to guarantee key strength?
128/1.5 = 85.33 = at least 86 characters. I thought about that, but is it really that simple? It feels like that calculation is missing something.
Apr
8
comment Given a certain entrophy per character, how long should a passphrase be to guarantee key strength?
Ah yes the 40.85 is bits, it will have to be converted back. So that's 40.85 / 4.7 = 8.69 characters. Meaning it needs at least a 9 character passphrase to guarantee the strength if i'm not mistaken?
Apr
8
comment Given a certain entrophy per character, how long should a passphrase be to guarantee key strength?
The Wikipedia page says that with an entrophy of 2 bits, an attacker would need half the time to break a passphrase. So this means the key would need to be double the length. Or in my case, the key would have to be 128*1.5 = 192 bits. And 192/4.7 = 40.85. This would mean my original answer was correct?