The public-keysystem uses a pair of mathematically related sequences, one for encryption and the other for decryption.
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。
2
In a public-keysystem, for instance, if Zooey wants to send Franny an encrypted message, Franny would first send Zooey her publickey.
在公开钥匙系统中，举例来看，如果佐伊要向弗兰妮发送加密的报文，弗兰妮首先向佐伊发送他的公开钥匙。
3
As the encryption algorithm and decryption algorithm are open to everyone, so the private key storage management becomes an insecure part in publickeysystem.