Authentication service is a base of implementation of security mobile AD hoc network, mobile users can exchange data communications securely between each other by certificate service.

认证服务是实现安全移动自组网的基础，移动用户可以通过证书服务进行安全数据通信。

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This paper deeply researches on EKE protocol and CAPTCHA on the base of the knowledge of Data Encryption and Information Security.

本文主要在掌握了一定的数据加密与信息安全、身份认证等知识的基础上，对EKE协议和CAPTCHA作了较为深入的研究。

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The former should make the function of application integrated and the usage is easy, the latter required a data-base with powerful consistency and integrality, and nice security.

对于前者要求建立起数据一致性和完整性强、数据安全性好的库。 而对于后者则要求应用程序功能完备，易使用等特点。

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At the end of 2005, a single consolidated data base of personnel security clearance information was established and is easily accessible by authorized users to confirm who already has what clearances.

WHITEHOUSE: Statement of Clay Johnson III

"There are just a handful of applications that need to run native 64-bit, like the data base applications and security, which is significantly enhanced on 64-bit, " Pope said.

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