电子邮件是由发件人寄出之后被储存到网络供应商的服务器上,然后等待收件人收取的电脑传递过程。倘若收发双方经过不同的网络供应商,邮件还会在服务器之间互相传递,最后才送至收件一方。因此,传送和存放的时候,电子邮件可以说是全无安全可言的,因为邮件的内容很容易被人偷看甚至篡改。要使电子邮件不致泄密,就必须对其进行电子加密措施。目前,加密的形式一般分为两大类:一是对称式加密,无论是编码还是解码的时候,都是采用同样方式。其优点是计算速度快、省时易用,而缺点是没有安全传送密码的方法,你总不可能每次都约晤不同的收件人并面对面地将收件密码告诉对方吧!二是当今最为流行的 E-mail is sent by the sender after being stored to the network provider’s server, and then wait for the recipient to receive the computer transfer process. If the sender and receiver through different network providers, mail will be passed between servers, and finally sent to the receiving party. Therefore, when sending and storing, e-mail can be said that there is no security at all, because the contents of the e-mail can be easily peeped or even tampered with. To keep your email from being compromised, you must electronically encrypt it. At present, the form of encryption is generally divided into two categories: First, symmetric encryption, whether it is encoded or decoded, are using the same way. The advantage is the calculation speed, time-saving and easy to use, but the disadvantage is that there is no safe way to pass the password, you can not always meet each other different recipients and face to face to receive the password to tell each other! Second, today The most popular