They provide services such as security, transactional integrity, high availability, and so on.
它们提供安全性、事务完整性、高可用性等服务。
A digital sign that ensures the message integrity such as the provider's identity.
数字签名以确保消息的完整性，如提供商身份。
A digital sign that ensures the message integrity such as the provider's identity.
数字签名以确保消息的完整性，如提供商身份。
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