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pseudorandom number

   Also found in: Wikipedia 0.04 sec.
(programming)pseudorandom number - One of a sequence of numbers generated by some algorithm so as to have an even distribution over some range of values and minimal correlation between successive values.

Pseudorandom numbers are used in simulation and encryption. They are pseudorandom not random because the sequence eventually repeats exactly and is entirely determined by the initial conditions.

One of the simplest algorithms is

x[i+1] = (a * x[i] + c) mod m

but this repeats after at most m numbers and successive numbers are closely related. Better algorithms generally use more previous numbers to calculate the next number.

http://random.mat.sbg.ac.at/.
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After that initial choice, the algorithm produces each new pseudorandom number by multiplying the preceding number by 17, dividing the result by 13, and taking the remainder.
Take a chance: scientists put randomness to work by Klarreich, Erica / Science News
NIST has developed a suite of 16 tests to check the randomness of binary sequences produced by random or pseudorandom number generators that may be used for many purposes, including cryptographic, modeling, and simulation applications.
NIST DEVELOPS RANDOMNESS TESTS FOR RANDOM AND PSEUDORANDOM NUMBER ... by Journal of Research of the National Institute of Standards and Technology
Therefore, the code pattern like the conventional pseudorandom numbers is unlikely to be decoded, and as a result it is possible to build advanced security system such as authentication on the high-speed network, password generation, electronic lock and electronic key of cars.
FDK Launches High-Performance General Purpose Physical Random Number ... by Business Wire
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