很多基本上是秘钥系统的加密软件包采用明钥加密，来传送秘密的会话密钥。
Many encryption packages that are basically secret-key systems use public-key encryption to communicate the secret session keys.
明钥系统采用一对数学上相关的序列，一个用于加密，另一个用于解密。
The public-key system uses a pair of mathematically related sequences, one for encryption and the other for decryption.
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