We were told a (kind of) similar story in high school: https://medium.com/intuition/explain-this-or-i-will-shoot-yo...
17 karma · joined February 13, 2017
It's really interesting because it only uses hash function and doesn't rely on trapdoor function! I think quite many people (me included) only learn about digital signature after public key cryptography, so it's quite a surprise to know about Lamport signature. Also, IIUC, because it doesn't rely on trapdoor function it also resistant against quantum computer in the future