课程: Computer Science Principles: The Internet
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Caesar's cypher and keys
- Messages that are transmitted over the internet using protocols like TCPIP, are visible to the rest of the network. So any message could be intercepted and read as you request and send information. Servers that handle sensitive information or products that want to offer greater encryption, such as messaging apps, online shopping services, and banking applications, need to offer a way to encrypt. But making messages secret isn't a new thing. It has been required for millennia. In fact, one of the earliest forms of encryption is called Caesar's Cipher. It was created by Julius Caesar during the time of the Roman Empire. It works on the principle of the alphabet. Take my name, Doug. It has four letters, D, O, U and G. If you take the alphabet and put it on a flip dial, you have a collection of 26 letters. For each letter in a word, you'll add a dial. Through flipping the dial, you can spell a message. This is similar to how you send messages over the internet. But instead of simply…
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