D-Link says it has become the world's first company to add CAPTCHA to its home routers, which is says provides an extra level of security for its users.

As most of you will know, a CAPTCHA, graphical authentication technology, is a challenge response test that ensures that a response is not computer-generated and instead entered by human hand.

By integrating CAPTCHA into its home and small office routers, D-Link says it's "addressing the recent increase in Internet security attacks on computers through Trojan horses that are downloaded unknowingly by Internet users. These Trojan horses then attack the router and alter their DNS records to divert all traffic through a target network".

The CAPTCHA feature is currently available on D-Link’s DIR-685 Wireless N Storage Router while the DIR-615, DIR-635, DIR-655, DIR-825, and DIR-855 will soon get the tech.