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Originally Posted by andi_germany
Sorry but there is a lot of bull in this post and a lot of conclusions that actually are so wrong that it gives you such a false sense of security.
1. Fact. Image verification is broken. ALL images have been proven to be broken by machines so you are in false security. You get keep the script kiddies out but the serious crackers are in.
2. Fact. Brute force starts with dictonary attacks as hardly anyone not forced to use capital or numbers not uses a normal word which renders your calculations kind of useless.
3. Fact. You actually assume a lot in your chance calculation but forgot to calculate that if you don't require people to use capital or numbers people simply use lowercase and even a dictionary word for the same reasons you assumed they use a capital first letter.
Dictionary words bring you to about 1:100000 or even less or at most 1:26^8
4. Fact. You might actually break laws using captcha verification. In many countries there are accessability laws for people that have disabilities. Given that blind people won't watch porn but some lawmaker might actually use this to fuck you because they cannot get you otherwise.
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In adult there are probably 80 % of the attacks that are caused by script kiddies.