No, it is way more interesting than that. With entangled particles together with a public unencrypted classical communication channel you can create a protocol to exchange information securely. That protocol does not rely on any computational complexity assumptions, rather only on the assumption that the laws of quantum mechanics are correct. There are some caveats, but it is still an amazing construction.

https://en.wikipedia.org/wiki/Quantum_key_distribution

https://en.wikipedia.org/wiki/BB84