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...This randomness is often collected from hardware sources, either pre-existing ones such as mouse movements or specially provided randomness generators. Examples for applications that depend on entropy (random numbers) would be the fortune(6) program, which gives a random quote, or the solitaire card game, or the shuffle option in a music player. Without random numbers these programs would generate the same results every time they run. High security uses for entropy would be applications that create cryptographic keys. Even after the key is eventually replaced, everything it was used to encrypt remains only as safe as the entropy used to generate the key. ...