key-encryption key

例句：

1. 1.The security of the system relies heavily on the key-encryption key.
   系统的安全性严重依赖于密钥。
2. 2. The encryption process requires a key-encryption key to ensure data security.
   加密过程需要密钥来确保数据安全。
3. 3.The company's new encryption key has been successfully tested and is now in use.
   公司的新加密密钥已成功测试并投入使用。