▶ 13.1 Communications Security
Earlier in the text, we focused on protecting information by keeping threats away from our network. If we connect our network with the internet, we firewall the connection to try to exclude internet-based threats—but this doesn’t help us when we need to transfer information between internet sites. The data leaves our control, so we need cryptography to protect it.
This is the traditional purpose of encryption: to protect data in motion. Although we introduced encryption in Chapter 7 as a way to protect diaries or copyrighted materials, most of cryptography’s history applies to communications security. Julius Caesar created his cipher to protect military dispatches from being read by enemies. The first large-scale ...
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