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Just as with other components of a cryptosystem, a software random number generator should be designed to resist certain attacks. Some attacks possible on a RNG include (from [3]): Direct cryptanalytic attack when an attacker obtained part of the stream of random bits and can use this to distinguish the RNG output from a truly random stream.
Middle-Square Weyl Sequence RNG (see also middle-square method) 2017 B. Widynski [34] [35] A variation on John von Neumann's original middle-square method, this generator may be the fastest RNG that passes all the statistical tests. xorshiftr+: 2018 U. C. Çabuk, Ö. Aydın, and G. Dalkılıç [36] A modification of xorshift+.
TESTU01 offers several batteries of tests including "Small Crush" (which consists of 10 tests), "Crush" (96 tests), and "Big Crush" (106 tests). The specific tests applied by each battery are detailed in the user's guide. [3] On a 1.7 GHz Pentium 4 running Red Hat Linux 9.0, for a simple RNG, Small Crush takes about 2 minutes. Crush takes about ...
On Windows 10 and Windows 11, the activation process can also generate a "digital entitlement", which allows the operating system's hardware and license status to be saved to the activation servers, so that the operating system's license can automatically be restored after a clean installation without the need to enter a product key.
Dice are an example of a mechanical hardware random number generator. When a cubical die is rolled, a random number from 1 to 6 is obtained. Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols is generated that cannot be reasonably predicted better than by random chance.
For example, squaring the number "1111" yields "1234321", which can be written as "01234321", an 8-digit number being the square of a 4-digit number. This gives "2343" as the "random" number. Repeating this procedure gives "4896" as the next result, and so on. Von Neumann used 10 digit numbers, but the process was the same.
A standalone macro-recorder program allows a user to "record" mouse and keyboard functions for "playback" at a later time. This allows automating any activity in any software application: from copy-pasting spreadsheet data to operating system maintenance actions.
In the asymptotic setting, a family of deterministic polynomial time computable functions : {,} {,} for some polynomial p, is a pseudorandom number generator (PRNG, or PRG in some references), if it stretches the length of its input (() > for any k), and if its output is computationally indistinguishable from true randomness, i.e. for any probabilistic polynomial time algorithm A, which ...