Public Key Cryptography, Cryptography, Encryption, Asymmetric Encryption.
has a box with a lock. He has a key that can lock and unlock that box. If he wants to protect something, he puts it in the box and locks it. That’s it: one key, and you can use it to encrypt (lock) and decrypt (unlock) your data (anyone can use that key). Photo from Unsplash from Lena De Fanti