访问控制是信息安全保障机制的核心内容，是实现数据保密性和完整性机制的主要手段。
The access controls is the key content of the security mechanism of the information safety, it is main means that realizes the mechanism of the privacy and the integrality of the data.
PKI的基础技术包括加密、数字签名、数据完整性机制、数字信封、双重数字签名，数字证书等。
The basic technology of PKI include encipher digital signature data integrity mechanism digital envelope double digital signature, digital certificate etc.
消息完整性和私密性：这种机制确保在传输期间第三方无法读取或修改消息，它实际上来自请求者。
Message integrity and privacy: a mechanism to ensure that messages cannot be read or modified by third parties during transmission, and that it is actually coming from the requester.
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