However, this policy USES symmetric encryption.
然而，这个策略使用对称加密。
The difference between symmetric and asymmetric encryption
对称和非对称加密间的差异
A symmetric key is one key that is used for both encryption and decryption.
对称密钥是加密和解密都使用的一个密钥。
A symmetric key is one key that is used for both encryption and decryption.
对称密钥是加密和解密都使用的一个密钥。
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