Encoding and decoding

What other interesting examples of codes from history or the modern-day (digital or non-digital) can you find to inspire or support a lesson about encoding and decoding messages?

I would like to share that in one of my lessons where the students need to do some research about several topics being given by subject teacher. One of the group got encryption topic related with the encoding. The student got the topic about lava lamp encryption. This is one of a new method in doing encryption.

To produce the unpredictable, chaotic data necessary for strong encryption, a computer must have a source of random data. The “real world” turns out to be a great source for randomness, because events in the physical world are unpredictable.

As one might expect, lava lamps are consistently random. The “lava” in a lava lamp never takes the same shape twice, and as a result, observing a group of lava lamps is a great source for random data.

To collect this data, Cloudflare has arranged about 100 lava lamps on one of the walls in the lobby of the Cloudflare headquarters and mounted a camera pointing at the lamps. The camera takes photos of the lamps at regular intervals and sends the images to Cloudflare servers. All digital images are really stored by computers as a series of numbers, with each pixel having its own numerical value, and so each image becomes a string of totally random numbers that the Cloudflare servers can then use as a starting point for creating secure encryption keys.


The video reference about lava lamp. https://www.youtube.com/watch?v=1cUUfMeOijg

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