[Cryptography] Network Security Part I

最新推荐文章于 2024-12-16 13:51:40 发布
最新推荐文章于 2024-12-16 13:51:40 发布
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分类专栏： Cryptography 文章标签： security 网络 gateway
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本文链接：https://blog.youkuaiyun.com/linjiayuqazwsx/article/details/50373529
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本文深入探讨了网络架构的基础组件，包括Hub、Switch、Router、Gateway等，解释了它们在局域网与更广泛网络之间的角色与区别。同时，介绍了防火墙的作用与网络协议的重要性，以及IPsec和Transport Layer Security在数据交换与加密过程中的应用。此外，文章还讨论了网络威胁与安全策略，旨在为读者提供全面的网络基础与安全知识。

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(1) Hub, Switch, Router, Gateway

  Hub: like center
       it can not choose which directions to go

  Switch: choose which direction they send in the LAN

  Router: forward from LAN to LAN

  Gateway: can communicate between LAN and other networks


  Gateway vs Router:

from here

     1. 概念上不是一回事。路由器是负责选择数据包转发路径的设备；而网关就是充当网络出口的设备，相当于上网要经过的关卡。这样说来，网关就是路由器的一个子模块而已。
     2. 事实上很多厂家的路由和网关都是一种设备。叫法不同，是他们根据应用场景来的。

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(2) Firewalls

   special gateway
   protect from inappropriate access

(3) Network Protocols

data exchange between computers to communicate and share

这里写图片描述

(4) Network Layer Security

packet switching:
   messages are divided into fixed-size,numbered packets

IP sec:
   goals: secure traffic between two IP systems.
   保证在转发的路上是安全的

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(5) Transport Layer Security

 SSL secure socket layer
 https: secure communications between browser and server

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SSL

 SSL:
   data exchange and encryption

 SSL session:
     between browser and server
     created by three-hand shake protocol

 SSL connection:

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(6) IPsec VS SSL

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(7) Network Security Threats

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