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April 03, 2013, 08:12:22 AM |
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Yes, the built in password encryption of bitcoin-qt uses AES, and can take passwords as long as you can remember. Someone tried a string of 100,000 (one hundred thousand characters) and it worked, and another password of 100,001 characters with the same first 100,000 not working. So it effectively has no limit and hashes the entire input string. I suggest using passwords at least 15 alphanumeric characters long, and no need to go higher than 100.
The usual password (or passphrase) practices apply: don't use your name, your mom, your dog, significant dates, etc. Use letters, numbers, even symbols and spaces. I personally stick to letters and numbers but long enough, like 20+, that are generated randomly, either by software or by dice rolls (coin flips work too, but too hard; go buy dice).
I don't know anything about 1password or Knox, sorry.
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