On 07.07.2013, Hauke Laging wrote:
> Even with the default settings a 19-digits passphrase (upper and lower case
> ASCII letters and digits) is as hard as AES (without flaws).
When you take all printable ASCII-chars as "headroom", with
B = entropy in bits
L = length of the passphrase
P = amount of possible chars ("headroom")
then
B = (L*log P / log2)
will calculate your passwords entropy in bits. Your 19-chars password
accounts for 124 bits of entropy, which is nearly half of AES-256's
strength (there are P^L different passwords). One assumes that in most
cases, trying 50% of all possible passwords will lead to success).
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