Network Security
Data on the network is analogous to possessions of a person. It has to be kept safe from others with malicious intent. This purpose ranges from bringing down servers on the network to using people's private information like credit card numbers to sabotage of major organizations with a presence on a network. To protect data, one has to ensure that it makes sense only to those for whom it is meant.Now, This is the case for data transactions where we want to prevent eavesdroppers from listening to and stealing data. Other aspects of security which involve protecting user data on a computer by providing password restricted access to the data and maybe some resources so that only authorized people get to use these & identifying miscreants and thwarting their attempts to cause damage to the network among other things.
网络安全性的不同问题如下：
1。验证：我们必须检查是否确实允许要求某物或已发送电子邮件的人这样做。在这种方法中，我们还将查看该人如何对其身份验证他对远程机器的身份。
2。Integrity:We have to check that the message which we have received is indeed the message which was sent. Here CRC will not be enough because somebody may deliberately change the data. No one along the route should be able to change the data.
3。Confidentiality:没有人应该能够在方式上读取数据，因此我们需要加密
4.非替代：一旦我们发送了一条消息，我们就不可能否认发送它，我们必须承认我们已经发送了它。
5.授权：这是指适合特定客户的服务。即使对用户进行身份验证，我们可能会决定不授权他使用特定服务。
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