ELI5 Where's Waldo - what does Waldo have to do with cryptography?

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 Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: blob_io, evenspoonier, tdscanuck, vvbb22 and nuditi To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]