凛凛
https://i.imgur.com/mLj4PeF.jpg
https://i.imgur.com/fIyAnHI.jpg
https://i.imgur.com/siRltUq.jpg
https://i.imgur.com/2Sx843u.jpg
https://i.imgur.com/gNgvfTl.jpg
Alice orders a pink car from the car salesmen Bob
After seeing the pink car, Alice states that she has never ordered it:
How can Bob prove towards a judge that Alice has ordered a pink car? (And that he did not fabricate the order himself)
Symmetric cryptography fails because both Alice and Bob can be malicious
Can be achieved with public-key cryptography