ELI5 Where’s Waldo - why Waldo is an important character in cryptography?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why is Where’s Waldo called Where’s Wally in the UK and different names in other countries? How did the illustrator come up with the idea in the first place? Has Waldo become harder to find? Why is Where’s Waldo a well known example in cryptography for zero knowledge proofs?

... we explain like I'm five

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