리눅스 시스템에서 암호화 및 보안 기능을 위한 난수를 생성하는 데 사용된다. https://lwn.net/Articles/261804 https://major.io/p/check-available-entropy-in-linux/ https://www.baeldung.com/linux/entropy-pool-rngd https://stackoverflow.com/questions/19981189/how-does-the-kernel-entropy-pool-work https://effectivemadness.github.io/posts/linux-entropy/