12306.cn adopts image CAPTCHA to block ticket-buying software   

12306網站啟用圖形驗證碼 搶票軟件或失效

中新網IT頻道發現，鐵路訂票網站12306.cn啟用了圖形驗證碼，用戶每次登錄12306網站時，除了需要正確輸入用戶名和密碼外，還需要根據文字提示選擇正確的圖形驗證碼才能登錄成功。 [查看全文]

(ECNS) -- 12306.cn, China's official train ticketing website, has adopted an image recognition CAPTCHA system that requires a user to not only enter a username and password, but also choose the right images according to a clue presented. 

One insider stated that with the new system, one can no longer log into software with plug-ins that allow users to cut ahead of others when buying tickets online. 

A CAPTCHA, short for completely automated public turing test to tell computers and humans apart, is a type of challenge-response test used in computing to determine whether or not the user is real.

12306.cn has been the subject of numerous complaints, particularly around national holidays and Spring Festival, as it is often overwhelmed because of excessive use.

Such problems have spawned the creation of a number of "cut-in-line" services and websites designed to get around the system.