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Random number generators that use external entropy. These approaches combine a pseudo-random number generator (often in the form of a block or stream cipher) with an external source of randomness (e.g., mouse movements, delay between keyboard presses etc.). /dev/random – Unix-like systems; CryptGenRandom – Microsoft Windows; Fortuna
is exactly the Lehmer random number generator output sequence y n = ay n − 1 mod (ab − 1), reduced modulo b. Choosing a different initial value y 0 merely rotates the cycle of x's. Complementary-multiply-with-carry generators. Establishing the period of a lag-r MWC generator usually entails choosing multiplier a so that p = ab r −
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RDRAND (for "read random") is an instruction for returning random numbers from an Intel on-chip hardware random number generator which has been seeded by an on-chip entropy source. [1] It is also known as Intel Secure Key Technology, [2] codenamed Bull Mountain. [3] Intel introduced the feature around 2012, and AMD added support for the ...
Lavarand, also known as the Wall of Entropy, was a hardware random number generator designed by Silicon Graphics that worked by taking pictures of the patterns made by the floating material in lava lamps, extracting random data from the pictures, and using the result to seed a pseudorandom number generator. [1]
Fortuna (PRNG) Fortuna is a cryptographically secure pseudorandom number generator (CS-PRNG) devised by Bruce Schneier and Niels Ferguson and published in 2003. It is named after Fortuna, the Roman goddess of chance. FreeBSD uses Fortuna for /dev/random and /dev/urandom is symbolically linked to it since FreeBSD 11. [1]
Random.org (stylized as RANDOM.ORG) is a website that produces random numbers based on atmospheric noise. In addition to generating random numbers in a specified range and subject to a specified probability distribution, which is the most commonly done activity on the site, it has free tools to simulate events such as flipping coins, shuffling cards, and rolling dice.
Mac Pro (replacing the Power Mac G5) launched August 7, 2006. MacBook (replacing the iBook) launched May 16, 2006. MacBook Pro (replacing the PowerBook G4) launched February 26, 2008. iMac Aluminum, launched April 28, 2008. MacBook Air Unibody, launched January 15, 2008. MacBook Aluminum Unibody, launched June 8, 2009.