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In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random data. This randomness is often collected from hardware sources (variance in fan noise or HDD), either pre-existing ones such as mouse movements or specially provided randomness generators. A lack of entropy can have a negative impact on performance and security.

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  • Entropie (Kryptologie) (de)
  • Entropía (computación) (es)
  • Entropy (computing) (en)
  • Entropia (informatica) (it)
  • Entropia (computação) (pt)
  • Источник энтропии (ru)
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  • In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random data. This randomness is often collected from hardware sources (variance in fan noise or HDD), either pre-existing ones such as mouse movements or specially provided randomness generators. A lack of entropy can have a negative impact on performance and security. (en)
  • En la computación, la entropía es la aleatoriedad recogida por un sistema operativo o una aplicación para su uso en criptografía o para otros usos que requieren datos aleatorios. Esta aleatoriedad a menudo se obtiene de fuentes de hardware, ya sea preexistentes, tales como los movimientos del ratón o, si se dispone, de generadores de azar. (es)
  • Nell'informatica, l'entropia è un indice della casualità di un sistema operativo o di un programma, di crittografia o altro, che necessita di dati casuali. Questa casualità viene spesso generata da fonti hardware (come la variazione del rumore della ventola o dell'HDD). Essi possono essere sia preesistenti, come relativi ad i movimenti del mouse, sia generatori di casualità appositamente forniti. Una mancanza di entropia può avere un impatto negativo su prestazioni e sicurezza. (it)
  • Na computação, entropia é a aleatoriedade coletada por um sistema operacional ou aplicativo para uso em criptografia ou outros usos que requerem dados aleatórios. Essa aleatoriedade é frequentemente coletada de fontes de hardware (variação no ruído do ventilador ou no HDD), tanto aquelas pré-existentes como movimentos do mouse ou geradores de aleatoriedade especialmente fornecidos. A falta de entropia pode ter um impacto negativo no desempenho e na segurança. (pt)
  • Источники энтропии используются для накопления энтропии, с последующим получением из неё начального значения (англ. initial value, seed), необходимого генераторам истинно случайных чисел (ГСЧ) для формирования случайных чисел. Отличие от генератора псевдослучайных чисел (ГПСЧ) в том, что ГПСЧ использует единственное начальное значение, откуда и получается его псевдослучайность, а ГСЧ всегда формирует случайное число, имея в начале высококачественную случайную величину, предоставленную различными источниками энтропии. Случайные числа имеют много применений в криптографии, например, для создания криптографических ключей, паролей. (ru)
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