Modern cryptosystem is divided into the public key system and the private key system.

现代密码体制分为公钥体制和私钥体制两大类。

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In this paper, a block based adaptive watermarking technique in DCT domain that is similar to the public key system is proposed in light of the cryptography technique and image processing technique.

结合加密技术与图像处理算法，提出了一种类似于公开密钥体制的基于分块dct变换的数字图像自适应水印算法。

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The first time you connect to a host, the system asks if you want to keep a copy of the remote hosts public key in your 'known hosts' file (see Listing 5).

您第一次连接到主机时，系统会询问您是否需要将远程主机公钥的副本保存在“已知主机”文件中(请参见清单5)。

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Insurance companies would no longer be allowed to deny health coverage based on pre-existing medical conditions a key point of weakness in and public anger with the current system.

VOA: standard.2009.07.21

Your credit card purchases over the Internet are protected by a brilliant "public key cryptography" system invented by three MIT researchers in 1977.

FORBES: I've got a secret