Introducing cryptography will create a fun and interactive way to learn to encode and decode information. Before writing was invented, people used knots to convey information. Different meanings were expressed in different sets of knots. Undoubtedly, the information conveyed was very limited compared to words, but it is similar to the principle of modern cryptography. I tried to introduce the concept of passwords in a group of younger children through learning, which was very intuitive and interactive. Even junior students can understand it very well.
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