There are cryptographic methods which allow me to send you a public encryption key which is mathematically related to a private decryption key. Brute forcing the private key is possible but computationally expensive. An AES 256 key has 2^256 different keys that would need to be checked it would take Frontier, the fastest supercomputer right now can do 1.1e18 calculations per second 5.1e78 seconds 2.32e71 years.
There are cryptographic methods which allow me to send you a public encryption key which is mathematically related to a private decryption key. Brute forcing the private key is possible but computationally expensive. An AES 256 key has 2^256 different keys that would need to be checked it would take Frontier, the fastest supercomputer right now can do 1.1e18 calculations per second 5.1e78 seconds 2.32e71 years.