Improved Captcha Method
Improved Captcha Method
复制标题
改进的验证码方法
DOI：
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复制
发表时间：
2010
期刊：
影响因子：
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通讯作者：
Devendra Tiwari
中科院分区：
文献类型：
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作者：
R. Soni;Devendra Tiwari
CAPTCHA是一个程序，可以告诉它的用户是人还是计算机。许多网站使用CAPTCHA来区分机器人（自动程序）和人类。使用CAPTCHA的主要动机是防止“机器人”或通常用于生成垃圾邮件的自动程序的滥用。CAPTCHA基本上使用扭曲形式的图像，机器人难以阅读，但人类可以轻松阅读。一些向用户提供免费服务的网站，一些匿名用户可以在自动计算机程序的帮助下在网站上进行虚假注册。CAPTCAHS用于防止虚假注册。其中一种CAPTCHA方法是Collage CAPTCHA。在这种方法中，一些形状显示与扭曲，并要求用户选择一个特定的对象，在本文中，我们增加了这种方法的抵抗攻击。为此，我们在屏幕左侧显示一些对象，在屏幕右侧显示一些对象，这些对象包含与屏幕左侧显示的图像相对应的名称。现在，我们要求用户在屏幕左侧选择对象，并在屏幕右侧选择特定图像（包含单词）。屏幕右侧的图像包含图像的名称。在此之后，用户被要求在两个图像下方显示的文本框中输入图像的名称。如果用户正确选择了两个相似的对象，并且在文本框中正确输入了图像的名称，则用户将通过测试。在这种方法中，由于计算机程序还应识别右侧的相似对象，并且需要在文本框中输入图像的名称，因此通过计算机测试的可能性更小。
CAPTCHA is a program that can tell whether its user is a human or a computer. CAPTCHAs are used by many websites to differentiate between the bots (automated program) and the human. The main motive behind using the CAPTCHA is to prevent abuse from "bots," or automated programs usually written to generate spam. The CAPTCHA basically uses images in distorted form that is difficult to read by the bots but they can be read by the human being easily. The websites which provide free services to the users some anonymous user can make false enrollment on the websites with the help of automated computer program. CAPTCAHS are used to prevent the false enrollment. One of the CAPTCHA methods is Collage CAPTCHA. In this method some shapes are shown with distortion and the user is asked to choose a specific object In this paper we increase the resistance of this method to attacks. For this purpose, we show some objects on the left of the screen and some of the objects on the right side of the screen which contain the name corresponding to the images shown on the left side of the screen. Now we ask the user to choose object on the left side and a specific image (containing word) on the right side of the screen. The image on the right side of the screen contains the name of the image. After this user is asked to enter the name of the image in a text box shown below the two images. The user will be passed the test if he chooses the two similar objects correctly and then he/she has entered the name of the image correctly in the text box. In this method because the computer program should also recognize the similar object on the right side and need to enter the name of the image in text box ,the possibility of passing the test by computer is more reduced.