可以通过将一个密码（希望不太弱）用作加密密钥来对密钥加密。
The key can be encrypted, using a password (hopefully not weak) as the encryption key.
这对加密密钥由私有密钥和公有密钥（私有，公共）组成的。
The pair consists of the private key and the public key (private, public).
首先，使用keytool创建用于保存生成的加密密钥的密钥库。
First, we use keytool to create a key store for holding a generated encryption key.
没有可用的加密密钥。返回了一个已知加密密钥。
No encryption key is available. A well-known encryption key was returned.
没有可用的加密密钥。返回了一个已知加密密钥。
No encryption key is available. A well-known encryption key was returned.
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