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Scrambling data so only the right people can read it.
Start with the idea
Encryption turns readable data into scrambled data using a key. Only someone with the correct key can turn it back.
One of the oldest examples is the Caesar cipher, where each letter is shifted a fixed number of places in the alphabet.
Modern encryption protects passwords, messages and online payments. The padlock in your browser's address bar means the connection is encrypted.
SEE IT ANOTHER WAY
A visual model
MAKE IT CONCRETE
One small example.
EXAMPLEPAUSE & THINK
Quick check.
Choose the best answer, then see why.
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Key terms.
Further reading.
Good next steps from trusted learning and standards sources.