4 ms·
That doesn't look at all impressive. It seems easy to write a solver for it. Especially considering most spam bots are quite happy with relatively low rates o
by warp 16y ago
That doesn't look at all impressive. It seems easy to write a solver for it. Especially considering most spam bots are quite happy with relatively low rates of succeeding, they can just brute-force until they find one they can solve.
- est 16y agoI think they use javascript to record the coordinate (x, y) where you clicked it on one scenario you 'll select a 24x24 square out of a 200x100 pixel picture, the success rate is 2.8%
- zebra 16y agoBots will be happy by any success rate above 0%
- oscardelben 16y agoI'd like to combine this with akismet. Bots will be happy with a 2% rate but I'll be more happy than them with 98% less comments to check in the spam folder
- est 16y agoa five digit case-ignore number/letter success rate is 1/(36^5), it's very small but still above 0%
- iDope 16y agoHi, I am the developer of clickcha. Appreciate the input, but you seem to be forgetting that bruteforcing can be avoided by temporarily banning the IP for some time after certain number of incorrect attempts.
- zebra 16y agoDon't forget that spammers exploit botnets with tens of thousands zombie computers each one with unique IP. 2.8% from 10000 zombies = 280 first try successful breaches.
- niklas 16y agoThat's why they use botnets for this. Each attempt will be from a fresh ip.
- timelinex 16y agoDon't give up though, you are on to something. If you can make the permutation higher then yea you can definitely make it big.
- stoney 16y agoYou could make it much harder for bots by asking the user to click on two numbers (e.g. highest and lowest). I don't think that would be too much extra work for the user as most of the effort is in scanning through all of the numbers.
- timelinex 16y agoI think it's higher than that. I think we can atleast use some kinda of processing to detect where the circle/square/retangles are. So, it is more like 1/9. So in 6 tries there is a 50% chance of success.
- patio11 16y agoWhy would I pick a pixel at random when I could pick a black pixel and have better than 10% chance of getting it right regardless of the question with less than 10 lines of code?