Abstract: An efficient and credible authentication schema was constructed based on the visual cryptography. It avoided the disadvantages of traditional cryptography by adopting only two cryptography components: visual cryptography and MAC, and the safety has not been lowered down. Bar code was introduced into this schema as secret image to reduce the complexity and difficulty of the server's auto-recognition of secret information which was hidden in images, so that made the schema more efficient. In the end of this paper, we analyzed the schema's safety, and the result showed that the new schema can resist common attack effectively.

Key words: authentication, visual cryptography, bar code, MAC

摘要： 基于视觉密码体制构造了一个高效、可靠的身份认证方案。在方案中仅仅使用了视觉密码和消息认证码两个密码组件，在不降低安全性的前提下，有效地避开了传统密码的缺点。方案中为认证服务器引入了条形码图像作为机密图像，有效地降低了服务器对图像中机密信息自动识别的难度和复杂度，使得方案更加有效、实用。最后对方案的安全性进行分析，说明方案可有效抵抗常见的攻击。

关键词: 认证, 视觉密码, 条形码, 消息认证码