Hotlan Trojan defeats captcha

Hotlan Trojan defeats captcha

A new Trojan horse that sends spam through Hotmail and Yahoo email accounts has antivirus companies worried that the commonly used "captcha" system, used to prove new members are real people, may have been compromised.

Captcha systems typically use a selection of alphanumeric characters that have been distorted and presented in a graphic with other elements designed to confuse character-recognition software. The idea is that, as only a person can read it and type in the correct sequence, spam bots and other malware can be stopped from automatically setting up accounts.

http://news.zdnet.co.uk/security/0,1000000189,39287905,00.htm
Hotlan Trojan defeats captcha - ZDNet UK