如果没有用户通过身份认证，则返回null。
如果没有用户通过身份认证，则返回null。
如果没有用户通过身份认证，则返回false。
一方面通过身份认证对商家资格严格把关，另一方面，通过支付宝，对交易进行安全保证。
On the one hand through the identity authentication of business qualification strictly, on the other hand, through paying treasure to trades security guarantees.
公钥基础设施PKI向信息使用者和提供者提供了认证功能，但在通过身份认证后，用户可以做什么，或说授权领域，则没有进一步涉及。
PKI has supplied the authentication feature for the information user and holder, but what can user do after the authentication, in this area PKI can't support.
通过适当地认证和访问控制，确保只有具有适当身份和经过授权的用户可以访问数据，可以处理大多数数据安全问题。
Most issues of data security can be handled by appropriate authentication and access control, ensuring that only properly identified and authorized users can access data.
通过增强访问控制、身份标识和认证提高UDDI数据完整性从而使安全性问题得以解决。
Security will be addressed by improving UDDI data integrity through enhanced access control, identity, and authentication.
身份认证——WebAuthenticationService是通过重定向调用的，导致用户要离开客户程序并被带到一个可能看上去完全不同的用户界面之前。
Authentication - the Web Authentication Service is invoked via a redirect, which "kicks" the user off the client app and takes him to a probably completely different looking UI.
用户认证协议：该协议从服务器到客户端进行身份验证，且通过传输层运行。
User Authentication protocol: This protocol authenticates the client to the server and runs over the transport layer.
证书允许用户通过JAAS供应者得到身份认证，并同时得到访问多种企业资源的身份认证。
Credentials allow the user to be authenticated through a JAAS provider and simultaneously authenticated to a wide variety of enterprise resources.
代理可以通过扩展的方式实现多重身份认证，进一步强化互联网用户的认证需求。
The proxy can be extended to implement multi-factor authentication and further strengthen the authentication requirements of Internet users.
通过实验分析，提出了基于ARP代理的身份认证方法，并对其运行方式进行了形式化描述。
Then one submits method of ID authentication based on proxy ARP after doing some experiments and describes formally it.
该网站的身份已通过XXX的认证，但没有公开审核记录。
The identity of this website has been verified by XXX but does not have public audit records.
DSPS的身份认证模块通过主体映射将用户的身份映射为不可信DBMS的账号。
The authentication module of DSPS maps the user's identity to user account in untrusted DBMS through principal mapping.
认证契据方案允许一方在不泄漏身份的情况下，通过第三方来向认证方证明自己身份的合法性。
An identity escrow scheme allows a part to prove validity of his identity to the authenticator through an authorized third party without revealing any information about his identity.
提出了一种新的身份认证与密钥协商协议，该协议可以实现通信双方的相互认证，并通过协商产生安全的会话密钥。
This paper proposed a new authentication and key agreement protocol which can realize mutual authentication and generate a secure session key agreed by both sides of communication.
文中介绍了一种通过USB接口进行用户身份确定的新型无源认证系统的实现，详细叙述了原理、设计思想及实现途径。
This paper introduces the design of one kind passive authentication of identity based on USB, detailed depicting the theory, design idea and realizing way.
第十一条联网企业需进行身份认证，通过计算机网络办理进出口通关及报核手续。
Article 11 a networked enterprise shall have its identity certified, and go through the formalities of customs release for export and of reporting for check through computer network.
通过分析研究虹膜上丰富的纹理特征，结合不同的特征提取方法和分类器可以实现虹膜的身份认证。
Through analyzing the iris feature and combining with different feature extraction methods, we can realize iris recognition.
公钥基础设施(PKI)通过公钥算法来实现身份认证和密钥交换，但由于其采用集中管理的模式，容易成为网络访问的瓶颈。
Public key infrastructures (PKI) achieve authentication and key exchange by utilizing public key cryptography; however, the system's centralized models tend to be the bottleneck in the network.
策略一是通过实名制认证的方式，防止用户通过不断伪造自己的身份。
The first strategy prevents users from forging their own identity through real-name system.
同时，在可信计算技术中，终端计算机是通过用户身份认证来实现安全的远程访问，用户在实现远程认证的同时也要求保护自己的隐私不被泄漏。
Remote attestation which the users are used to identify themselves to connect remote communication is required in the trusted computing. As well as the users require to protect their privacy.
本文通过对SSL及其关键技术的研究，提出了在网络数据库系统的用户访问控制中使用基于SSL和证书的双向身份认证。
Through study on SSL and its key technology, it is recommended that the SSL-based certificate authentication can be used as client access control method in database systems.
基于IBE的身份认证方案无需通过颁发数字证书来绑定用户身份和公钥，可以提高认证效率。
The IBE-based identity authentication scheme, which is without the need for issuing digital certificates to bind user identity and public key, can improve the certification efficiency.
电子签名在网络环境下实现了传统手写 签名的功能，而对 签名 人身份真实性的确认则是通过电子认证来完成的。
To acknowledge in writing on the face of(a check) that the signature of the maker is genuine and that there are sufficient funds on deposit for its payment.
电子签名在网络环境下实现了传统手写 签名的功能，而对 签名 人身份真实性的确认则是通过电子认证来完成的。
To acknowledge in writing on the face of(a check) that the signature of the maker is genuine and that there are sufficient funds on deposit for its payment.
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