These can be used for sender authentication, where the HTTP client is supposed to send a message.

它可以用于发送方身份验证，在这种情况下HTTP客户机应该用来发送消息。

youdao

Users require confidentiality, message integrity, sender authentication and receiver non - repudiation.

用户要求机密性、消息完整性、发方鉴别和收方不可抵赖。

youdao

In order to satisfy the requirement of non-repudiation, you need both message authentication and sender authentication simultaneously.

为了满足不可抵赖性的要求，会同时需要消息身份验证和发送方身份验证。

youdao

The protocols for that kind of authentication, known as DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF) are hardly new.

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