/dev/random
Sign in to saveAlso known as /dev/urandom
thumb|upright=1.5|256 byte hex dump of In Unix-like operating systems, ' and ' are special files that provide random numbers from a cryptographically secure pseudorandom number generator (CSPRNG). The CSPRNG is seeded with entropy (a value that provides randomness) from environmental noise, collected from device drivers and other sources. Users can obtain random numbers from the CSPRNG simply by reading the file. Not all operating systems implement the same methods for and .
Gallery (4)
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RC4
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device file
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hardware random number generator
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cryptographically secure pseudo-random number generator
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Linux
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operating system
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Apple Inc.
Concept
macOS
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iOS
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bit
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kernel
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Q364
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FreeBSD
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Linux kernel
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OpenBSD
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device driver
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Q486487
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randomness
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Texas Instruments
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embedded system
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