Typically for one-to-one interactions we use the service public key to encrypt information (and provide confidentiality).

对于一对一交互，我们通常使用服务公钥来加密信息并提供机密性。

youdao

It is used so you can programmatically determine if the password is being used to encrypt information (rwflag = 1) or decrypt information (rwflag = 0).

使用它的目的是使我们可以编程确定这个密码是正在用来加密信息（rwflag = 1）还是解密信息（rwflag = 0）。

youdao

There is no way to delete the file, as it will simply be restored, but you can encrypt your iPhone back-ups to make the information somewhat less accessible.

你是没有办法删除这个文件的，因为它就是要存数据的，但是，你可以对能比的iPhone备份进行加密，以便确保对这一信息的访问不那么容易。

youdao

Interestingly enough, it appears that one of the reasons why Anonymous was able to attack the website was because Stratfor neglected to encrypt the credit card and other personal information about its subscribers.

FORBES: Stratfor Hacked; Anonymous Claims Responsibility

In fact, the best approach is to encrypt information as quickly as possible and keep it encrypted for as long as possible until it is actually needed, an approach sometimes called end-to-end encryption.

FORBES: The Epsilon Hack Attack: Time For "SOX For Consumers"?