如果你对所有部署的程序包进行SHA哈希加密，那么就可以证实没有在自动部署过程之外做过任何的修改。
If you keep SHA hashes of all deployed packages, then it's possible to verify that nothing has changed outside of the automated deployment process.
哈希密码比加密密码更安全，因为无法对其进行解密。
Hashed passwords are more secure than encrypted passwords because they can't be decrypted.
正如前面所提到的那样，消息和证书使用加密哈希来验证完整性。
As mentioned earlier, messages and certificates make use of cryptographic hashes to verify integrity.
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