Bremermann's limit

== English == === Etymology === Named after Hans-Joachim Bremermann (1926–1996), German-American mathematician and biophysicist. === Proper noun === Bremermann's limit The maximum computational speed of a self-contained system in the material universe, derived from Einstein's mass-energy equivalency and the Heisenberg uncertainty principle: it is approximately 1.36 × 1050 bits per second per kilogram. This value is important in designing cryptographic algorithms that can never be cracked by brute force.