Introduction: What are Private Keys?
Blockchains use various encryption algorithms. A crucial part of the encryption is a so-called private key, which amongst other things is used to authenticate a specific user on a blockchain. Thus it is easier and more secure to validate a transaction. A private key is a long, random string of letters and numbers. This string can be more than 80 characters long, which means that the number of different private keys is higher than the number of atoms in the universe. Whoever wants to test this for himself can visit the following website and try to come up with a private key that already has been used by somebody: https://keys.lol/ethereum/2.