Computer Networking › Section H · Security in computer networks › Topic H.1
What network security means
Every packet you send crosses links and routers that belong to strangers. Before studying the tools that protect traffic, it helps to pin down exactly what "secure" should mean and what an intruder on the path is able to do.
In this topic
- Talking safely over a path you do not control
- Four properties of secure communication
- What an intruder can do
- Why the network's own checks are not enough
- Worked example: naming the property at risk
- Who needs secure communication
- Security at every layer
- Worked example: threat-modelling an online purchase
- Cryptography is the foundation
- Common mistakes to avoid
- Key takeaways
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