Technical Details
Researchers from the Swiss Federal Institute of Technology in Zurich (ETH Zurich) have reported a breakthrough that was considered virtually impossible for decades: creating a sequence of numbers with provably perfect randomness. At first glance, the task seems simple. However, even the highest-quality dice, coins, and modern random number generators are slightly biased in practice. Some results appear more frequently than others due to tiny physical imperfections.
Background and Context
For most tasks, this is not a problem, but in cryptography, even minimal deviations can create potential vulnerabilities. A team led by physicists Renato Renner and Andreas Wallraff proposed a way to eliminate this problem. Their method is called "randomness amplification".
Industry Impact
The practical significance of the work may be enormous. Modern encryption systems, digital signatures, cryptocurrencies, blockchains, and secure communication channels depend on the quality of random numbers. If the source of randomness contains even a small predictability, it can potentially weaken the entire security system.