网络安全密码
PGP是由MG的PhilpZimmermann设计的一种电子邮件安全软件，现在已在网络上广泛传播，拥有很多的用户。PGP是一个免费软件，而且其设计思想和程序源代码都公开，通过不断的改善，其安全性逐步为大家所依靠。(PGP is a kind of email security software designed by PhilpZimmermann in the United States, and now it has been widely spread on the Internet and has many users. PGP is a free software, and its design ideas and program source codes are open. Through continuous improvement, its security is gradually relied on by everyone.)
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