You will use the private key to digitally sign the content, and send the public key along with the digitally signed message for the recipient to verify the digital signatures.

您将用私钥对内容进行数字签名，然后将公钥随着经过数字签名的消息一起发送到接收方，以便用来验证其中的数字签名。

youdao

Take five minutes each day to send a quick private message to your significant other, write on his Facebook wall-heck, even send a quick email to let him know you're thinking of him.

每天花上五分钟来给你的爱人发一个亲密的短信，在他的facebook墙上留言，甚至也可以发送一个简短的电子邮件来让他知道你想他。

youdao

If you want to send a private note to your friend John Doe, you encrypt that message with John Doe's public key (which you've stored on your own keyring).

如果您要将一封私有短信发送给您的朋友John Doe，您可以使用John Doe的公钥(您已经将其存储在自已的keyring中)加密该消息。

youdao

Often when that happens, someone from the company will send a private message to that person.

CNN: Get results by social networking with airlines

You could then possibly message to an individual buyer with our coming private chat or send out a tweet to your followers all for free.

FORBES: Hulu, Meet Twitter: Drund Tries to Take Your Desktop to the Cloud