不同於周圍幾乎所有的CAPTCHA系統,無意象驗證碼的工作,而不在服務器側的圖像處理庫的需要。
無意象驗證碼將產生一個隨機數,頁面為英語口語形式打印出來。
為了驗證表單並提交,用戶只需要編寫的CAPTCHA字段中顯示的號碼。
雖然這可能是易於中等難度黑客破解,使用無意象驗證碼的好處在於對碼和一個易於實現過程的輕質足跡。
兩個演示,為PHP和JavaScript版本,包含在無意象驗證碼標準的封裝。
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