他们交换的信息需要保密，来保护来源和（正当的）手段。
The information they swap should remain confidential, so as to protect sources and (legitimate) methods.
数据收集者确保数据保密，完整和质量所采取的手段。
The steps taken by the data collector to ensure the confidentiality, integrity and quality of the data.
文中论述了该系统的结构、邮递服务协议、邮递方式、信箱的管理及信件的保密和存取控制手段等问题。
The structure of the system, mail service protocols, mode of messaging, allocation of mailboxes as well as personal security for authentication and access control measures are discussed in this paper.
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