We all know that OCR technology can be exploited in breaking the CAPTCHA. Same applies for Audio CAPTCHA’s. Spammers can use voice recognition to break them.

They aren’t 100% effective doesn’t mean, we don’t use them. Further if we generate good CAPTCHA images, we can improve the effectiveness of them failing in OCR.

Yes, spammers can still use low-paid data entry workers and get them to break the CAPTCHA’s. It will always remain a cat and mouse game between spammers and the anti-spam technology. Unfortunately, the spammers have been winning so far.

This doesn’t mean that we cannot/ should not use the CAPTCHA’s. There isn’t a single solution that will help us from all our SPAM problems. We need to employ multiple barriers for spammers and having a good CAPTCHA engine is just one step towards it.

Most anti-spam strategies are “reactive” as they were made/ thought of once the spammer starts to bypass the existing strategy in place. We gotta be more proactive on this front and try to beat them. Whatever we do, low-paid data entry workers can take things away but the increased difficulties will definitely discourage many spammers.