“A block cipher doesn’t seem anything like a plasma, let alone a black hole, but the reshuffling of code characters is analogous to the churning of particles in the plasma. Bouland and his co-authors demonstrated their mathematical equivalence. Furthermore, decrypting a message encoded with a block cipher is equivalent to inferring the circuit complexity of a quantum state.”

https://www.quantamagazine.org/in-new-paradox-black-holes-appear-to-evade-heat-death-20230606/