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# Pseudo random generator algorithm

For the formal concept in theoretical computer science, see Pseudorandom generator. A pseudorandom number generator ( PRNG ), also known as a deterministic random bit generator ( DRBG ), is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers Pseudo Random Number Generator (PRNG) refers to an algorithm that uses mathematical formulas to produce sequences of random numbers. PRNGs generate a sequence of numbers approximating the properties of random numbers. A PRNG starts from an arbitrary starting state using a seed state Therefore, a PRNG is an algorithm that takes a seed as input and returns a longer string such that no one can easily say if it was calculated or not. The function computed by the algorithm is called G. The definition of G says that if the initial seed is a sequence of k bits, then G returns a longer sequence of l(k) bits Linear Congruential Method is a class of Pseudo Random Number Generator (PRNG) algorithms used for generating sequences of random-like numbers in a specific range. This method can be defined as: where, X, is the sequence of pseudo-random numbers m, ( > 0) the modulus a, (0, m) the multiplier c, (0, m) the incremen It is not so easy to generate truly random numbers. Instead, pseudo-random numbers are usually used. The goal of this chapter is to provide a basic understanding of how pseudo-random number generators work, provide a few examples and study how one can empirically test such generators. The goal here is not to learn how to write your own random number generator. I do not recommend writing you

### Pseudorandom number generator - Wikipedi

Deﬁnition A uniform pseudo-random number generator is an algorithm which, starting from an initial value U 0 ∈ [0 , 1] and a transformation D , produces a sequence U 0 ,U 1 ,...∈ [0 , 1] with The intuition is that a generator being pseudo-random means that an ﬃt algorithm cannot tell the ﬀ between a randomly generated string and a pseudo-randomly generated string. Here is another way of expressing this concept (in the nonuniform adversary setting). We say G is alternatively-pseudo-random if the following holds for every C: Let C = fCngbe a polynomial size family of circuits. Why this should be is not clear to me, as MT19937 is a mediocre algorithm distinguished by the mathematical proofs about it. It offers provable lack of short term correlation and provable very long period. It is a step up from LCGs, failing only the most stringent of statistical tests. The basic algorithm used is terrible, but the combination of large state size and output hashing (tempering) allows it to rise to the level of kinda-decent

Random number engines generate pseudo-random numbers using seed data as entropy source. Several different classes of pseudo-random number generation algorithms are implemented as templates that can be customized Cipher algorithms and cryptographic hashes can be used as very high-quality pseudorandom number generators. However, generally they are considerably slower (typically by a factor 2-10) than fast, non-cryptographic random number generators. These include: Stream ciphers

random bits for any BPP algorithm can be reduced from poly(n)to O(logn), and then eliminate the randomness entirely by enumeration. Thus, we would like to have a function G that stretches a seed of d = O(logn) truly random bits into m = poly(n) bits that look random. Such a function is called a pseudorandom generator. Th Pseudo-random number generator: : A polynomial-time computable function f (x) that expands a short time computable function f (x) that expands a short random string x into a long string f (x) that appears random

Algorithm AS 183 An Efficient and Portable Pseudo-random Number Generator By B. A. WICHMANN and I. D. HILL National Physical Laboratory, Clinical Research Centre, Teddington, Middx, TWJ] OLW, UK Harrow, Middx, HA] 3UJ, UK [Received April 1981. Revised February 1982] Keywords: PSEUDO-RANDOM NUMBERS; EFFICIENCY; PORTABILITY LANGUAGE Fortran 6 A pseudo-random number generator, or PRNG, is a random number generator that produces a sequence of values based on a seed and a current state. Given the same seed, a PRNG will always output the same sequence of values. Randomness: Random data that is unpredictable to the attacker, even if he is taking active steps to defeat our randomness. Entropy: A measure of the disorder, randomness or. Any particular pseudo-random number generation algorithm will behave like this. The problem with rand is that it's not specified how it is implemented. Different implementations will behave in different ways and even have varying qualities The generation algorithm takes as parameters the initial values of the three variables a, b and c; a (32-bit) is used as an entropy accumulator, b (32-bit) contains the previous pseudo-random word, and c (8-bit) is a simple counter, incremented at each round of the algorithm. Their initial values are public, and are not part of the secret. To be cryptographically secure a pseudo-random number generator must pass the next-bit test and withstand state compromise extensions. The next-bit test requires that given the first k bits of a random sequence there is no polynomial-time algorithm that offers a greater than 50% probability of correctly predicting the k + 1 th bit of the sequence

5.7: Pseudo-random Number Generation. All of the random sampling strategies discussed in the previous section require a random sample uniformly distributed in the range (0,1). Fortunately, there are several well known algorithms for generating such samples, called pseudo - random numbers. These algorithms are deterministic Pseudo-random number generator (PRNG) refers to the algorithms that use mathematical formulae or simply precalculated tables to produce number sequences with the similar properties of random number sequences. PRNGs are widely used in stochastic simulations, electronic games, signal processing and cryptography A pseudorandom number generator is a way that computers generate numbers. Computers aren't good at creating random numbers. We use an algorithm to make a random number. A good analogy is a jar of (numbered) marbles Pseudo Random Number Generator: A pseudo random number generator (PRNG) refers to an algorithm that uses mathematical formulas to produce sequences of random numbers. PRNGs generate a sequence of numbers approximating the properties of random numbers. This is determined by a small group of initial values. PRNGs are fundamental to the use of.

The simplerandom package is provided, which contains modules containing classes for various simple pseudo-random number generators. One module provides Python iterators, which generate simple unsigned 32-bit integers identical to their C counterparts See also randomized algorithm. Note: Any computer program is likely to generate pseudo-random numbers, not actually random numbers. This is important when, say, simulations are sensitive to subtle patterns in the random numbers used. Hardware-based random number generators are built from parts with naturally random events, such as noise in a. Home Magazines Communications of the ACM Vol. 17, No. 12 Algorithm 488: A Gaussian pseudo-random number generator article Algorithm 488: A Gaussian pseudo-random number generator

### Pseudo Random Number Generator (PRNG) - GeeksforGeek

Example Algorithm for Pseudo-Random Number Generator. A computer executes code that is based on a set of rules to be followed. For PRNGs in general, those rules revolve around the following: Accept some initial input number, that is a seed or key. Apply that seed in a sequence of mathematical operations to generate the result. That result is the random number. Use that resulting random number. Security Analysis of Pseudo-Random Number Generators with Input: /dev/random is not Robust? YevgeniyDodis1,DavidPointcheval2,SylvainRuhault3,DamienVergnaud2,andDanielWichs4 1 Dept.ofComputerScience,NewYorkUniversity. 2 DI/ENS,ENS-CNRS-INRIA. 3 DI/ENS,ENS-CNRS-INRIAandOppida,France. 4 Dept.ofComputerScience,NortheasternUniversity. Abstract. A pseudo-random number generator (PRNG) is a.

### Building a Pseudorandom Number Generator by David

Cryptographically Secure Pseudo-Random Number Generator (CSPRNG) This is the second entry in a blog series on using Java cryptography securely. The first entry provided an overview and covered some architectural details, using stronger algorithms and some debugging tips . This entry covers Cryptographically Secure Pseudo-Random Number Generators This short series will discuss pseudo random number generators (PRNGs), look at how they work, some algorithms for PRNGs, and how the... Back to School Special PRNGs (Pseudo-Random Number Generators) are deterministic algorithms that generate a finite sequence of numbers, completely determined by a small set of initial values called seeds, that looks like random as opposed to TRNGs (True Random Number Generators) which use an external source of entropy (that can not, hopefully, be predicted)..

A pseudo-random generator is a deterministic algorithm that produces a sequence of symbols (usually numbers). The main feature of PRG is connected to the impossibility to predict what value this algorithm will return. Pseudorandom generators (PRG) are used to create random sequences of numbers in deterministic devices. All computer algorithms are strictly deterministic The algorithm uses a Linear Congruential Generator (LCG) algorithm that produces a sequence of pseudo - randomized numbers that performs mathematical operations to transform numbers that appears to be unrelated to the Seed. Simulation result shows that the new PRNG algorithm does not generate repeated random numbers based on the frequency of iteration, a good indicator that the key for random. PSEUDO-RANDOM NUMBER GENERATOR BASED ON NEURAL NETWORK Migran N. Gevorkyan1, a, In this paper, we consider algorithms for generating uniformly distributed pseudo-random numbers by using bitwise operations. Two classes of such algorithms: xorshift [1,2] and kiss [3] are particularly simple, but give a high quality sequence of pseudo-random numbers. To verify the quality of the numbers.

Example Algorithm for Pseudo-Random Number Generator. A computer executes code that is based on a set of rules to be followed. For PRNGs in general, those rules revolve around the following: Accept some initial input number, that is a seed or key. Apply that seed in a sequence of mathematical operations to generate the result. That result is the random number. Use that resulting random number. Well I need a pseudo Random Number Generation algorithm which makes the numbers repeat after a certain userdefined period. Please some one help me with the same asap since I need it very badly and soon. Tanx for all the help. Regds Gautham Kasinath P.S. Sheriffs and Bartenders please forgive my posting the message here since I didnot now where to post the same. In the country of the blind. This is because no encryption algorithms has perfect entropy, or in layman's terms, no encryption algorithm is perfectly random. Because no key is perfectly random, it means that methods exist for predicting keys that do not require you to check every single possible key combination. So, while symmetric encryption like AES has very close to perfect randomness making 256-bit sufficient for all. As you've seen, switching from a pseudo-random to a quasi-random initialization strategy can boost the optimization algorithm's performance. This trick is really simple to apply to any global optimizer, you just have to change those lines of code that use the rand() function for your own low-discrepancy sequence generator

An algorithm and coding technique is presented for quick evaluation of the Lehmer pseudo-random number generator modulo 2 ** 31 -- 1, a prime Mersenne number which pro- duces 2 ** 31 -- 2 numbers, on a p-bit (greater than 31) computer. The computation method is extendible to limited problems in modular arithmetic. Prime factorization for 2 ** 61 -- 2 and a primitive root for 2 ** 61 -- 1, the. (2017) Fast and secure random number generation using low-cost EEG and pseudo random number generator. 2017 International Conference On Smart Technologies For Smart Nation (SmartTechCon) , 369-374. (2017) Enhanced spread in time on-off keying technique for dense Terahertz nanonetworks Pseudo-random number sampling is the numerical practice of generating pseudo-random numbers that are distributed according to a given probability distribu-tion. It is hard to design a algorithm to directly sample a random variable from a pdf in a high-dimension space. So We ﬁrst restrict ourself to the simpler problem: drawing a sample from uniform distribution on [0,1]. Once we solve that. Pseudo-random numbers generator Javascript Linear Congruential Generator (code snippet available below) First setting up constants needed for calculation: Seed value s 0. Multiplier a. Increment c. Modulus m. Calculate a number. Results: LCG is a one of the simpliest algorithms for producing a sequence of pseudo-random numbers. Each next number is calculated based on the previous one and also.

### Linear Congruence method for generating Pseudo Random

• sindresorhus / random-bytes-readable-stream. Sponsor Star 71. Code Issues Pull requests. Creates a readable stream producing cryptographically strong pseudo-random data using `crypto.randomBytes ()`. nodejs crypto random npm-package random-bytes pseudo-random-generator nodejs-stream readable-stream. Updated on Jan 23
• The drand48(), erand48(), jrand48(), lrand48(), mrand48() and nrand48() functions generate uniformly distributed pseudo-random numbers using a linear congruential algorithm and 48-bit integer arithmetic. The functions drand48() and erand48() return nonnegative, double-precision, floating-point values, uniformly distributed over the interval [0.0,1.0). These functions have been extended so that.
• What these algorithms generate are PSEUDO-random numbers. The practical definition of pseudo randomness is that the numbers should not be distinguishable from a source of true random numbers in a given application. So one generator may be good enough for one application, but fail badly in another application. True random numbers should not fail in any applications. There are libraries of tests.
• Title: Reduction of Qubits in Quantum Algorithm for Monte Carlo Simulation by Pseudo-random Number Generator. Authors: Koichi Miyamoto, Kenji Shiohara. Download PDF Abstract: It is known that quantum computers can speed up Monte Carlo simulation compared to classical counterparts. There are already some proposals of application of the quantum algorithm to practical problems, including.
• g that we are given an algorithm for generating pseudo-random bits. These bits should have probability 50% of being in each of two states, and be statistically independent. Our approach is to choose oating-point values in the range such that the probability that a given.

In order to program a computer to do something like the algorithm presented above, a pseudo-random number generator typically produces an integer on the range from 0 to N and returns that number. Coding the Lehmer pseudo-random number generator Communications of the ACM, February 1969, Vol 12 Number 2 85-86 p85-payne.pdf After I made this page, it emerged that this paper, rather than David Carta's, is the first publication of the simple algorithm of shifting and adding bits, rather than performing division, to achieve the mod(0x7FFFFFFF) result. Pierre L'Ecuyer 1988 (L88) Pierre L. Pseudo random number generator based on quantum random walks In this section, we discuss how to construct the QRWs-based PRNG by running the one-dimensional discrete QRWs on a circle Python random module. The built-in Python random module implements pseudo-random number generators for various distributions. Python uses the Mersenne Twister algorithm to produce its pseudo-random numbers. This module is not suited for security. For security related tasks, the secrets module is recommended

A pseudo-random Number Generator in Java (PRNG) is an implementation of an algorithm that produces the number in the sequence that is uniformly distributed numbers that looks random, but is, in fact, deterministic (the sequence is generated from some unknown internal state), hence pseudo-random. When you use Pseudo-random numbers in statistics, the only thing you care about is the sequence of. Stellt einen Generator für Pseudozufallszahlen dar, d. h. ein Algorithmus, der eine Zahlenfolge erzeugt, die bestimmte statistische Anforderungen hinsichtlich ihrer Zufälligkeit erfüllt.Represents a pseudo-random number generator, which is an algorithm that produces a sequence of numbers that meet certain statistical requirements for randomness

In this paper, we propose a novel algorithm for pseudo random number sequence generator based on the samples of Chen chaotic system. The proposed algorithm can be used to generate cryptographic keys for digital images among the cryptography applications. Moreover, our pseudo random number generator solves the problem of the non-uniform probability distribution of sequence generated directly by. The chosen numbers are not completely random because a definite mathematical algorithm is used to select them, but they are sufficiently random for practical purposes. The current implementation of the Random class is based on Donald E. Knuth's subtractive random number generator algorithm, from The Art of Computer Programming, volume 2: Seminumerical Algorithms Every random number generator uses a different algorithm. Unity random number generation uses Marsaglia's Xorshift 128 algorithm. Though the generated number or sequence in Unity is pseudo-random, it is mostly sufficient for the application in games. In this post, we will see the different random number algorithms, what a random seed is and how to generate random int and random float in.

### big list - Pseudo-random number generation algorithms

• ed by an input called the seed. The default PRNG in most statistical software (R, Python, Stata, etc.) is the Mersenne Twister algorithm MT19937, which is set out in Matsumoto and Nishimura (1998)
• The random module provides a fast pseudorandom number generator based on the Mersenne Twister algorithm. Originally developed to produce inputs for Monte Carlo simulations, Mersenne Twister generates numbers with nearly uniform distribution and a large period, making it suited for a wide range of applications. Generating Random Numbers¶ The random() function returns the next random floating.
• The GNU C library's random() function provides pseudo-random numbers via a linear additive feedback method. A description of the exact algorithm used is hard to find, so I have documented it here. The random(3) man page states, misleadingly, that the random() function uses a non-linear additive feedback random number generator. This is not actually true, as the feedback is in fact linear.

Deterministic Random Bit Generator The algorithms specified in NIST SP 800-90A, Recommendations for Random Number Generation Using Deterministic Random Bit Generators (DRBG) for generating random bits. 4.2 Abbreviations ABBREVIATION MEANING DRBG Deterministic Random Bit Generator DRBGVS Deterministic Random Bit Generator Validation System IUT Implementation Under Test 5 Design Philosophy of. The repeated use of the same subsequence of random numbers can lead to false convergence. In Fig. 4.8, results of the Buffon's needle simulation used in Example 1.4 are shown for the case D = 2L. However, in this simulation a great many random numbers were discarded between needle drops so that after about 500 simulated needle drops, the cycle length of the random number generator was exceeded The mathematical algorithms, no matter how perfect they can be, are not capable to generate combinations of random numbers. The only thing that can be considered absolutely random are the events. In mlsjunkgen: Use the MLS Junk Generator Algorithm to Generate a Stream of Pseudo-Random Numbers. Description Usage Arguments Value Examples. View source: R/mlsjunkgenm.R. Description. Based on user input seeds, this function generates a vector of n pseudo-random numbers by calling mlsjunkgenv which in turn calls junkgen The pseudo-random sequence generator described in this article is both fast and statistically sound. Its period is long enough for most applications, and it has been optimized for fast execution on 32-bit microprocessors. In addition, it has no machine-dependent operations, so a specific sequence generated on one machine will be exactly the same as a sequence generated on another. The.

### Pseudo-random number generation - cppreference

• istisch ist. Daher sollte er mit Zufallsbits geimpft werden. Die Funktion srand wird verwendet, um den Pseudo-Zufallszahlengenerator zu.
• Sometimes it is useful to be able to reproduce the sequences given by a pseudo-random number generator. By re-using a seed value, the same sequence should be reproducible from run to run as long as multiple threads are not running. Most of the random module's algorithms and seeding functions are subject to change across Python versions, but two aspects are guaranteed not to change: If a new.
• The difference between true random number generators (TRNGs) and pseudo - random number generators (PRNGs) is that TRNGs use an unpredictable physical means to generate numbers (like atmospheric.

### List of random number generators - Wikipedi

Pseudo-random number generators (PRNGs) use algorithms to transform a seed into a sequence of pseudo-random numbers. These generators can be fast and produce well-distributed unpredictable random numbers (or not). They are usually deterministic: given algorithm and seed, the output sequence can be reproduced. They have finite period and eventually loop; with many algorithms this period. A new algorithm called Mersenne Twister (MT) is proposed for generating uniform pseudorandom numbers. For a particular choice of parameters, the algorithm provides a super astronomical period of 2 19937 −1 and 623-dimensional equidistribution up to 32-bit accuracy, while using a working area of only 624 words. This is a new variant of the previously proposed generators, TGFSR, modified so as.

### Algorithm AS 183: An Efficient and Portable Pseudo-Random

1. During the implementation phase, due to space constraint, a cryptographically secure random-number-generator could not be used, and instead of using a TRNG (True Random Number Generator), a LFSR (Linear Feedback Shift Register) is used to generate a random value. While an LFSR will provide a pseudo-random number, its entropy (measure of randomness) is insufficient for a cryptographic algorithm
2. Random number generators can be hardware based or pseudo-random number generators. Hardware based random-number generators can involve the use of a dice, a coin for flipping, or many other devices. A pseudo-random number generator is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. Computer based random number.
3. istic Random bit generator is an algorithm used for generating a variable from a sequence of numbers with similar properties as a random number. The PRNG generates a huge sequence of numbers from an initial number known as Seed. The sequence generated from PRNG is repeated after a long period. Pseudo Random Number Generator in.
4. Algorithmic random number generators are everywhere, used for all kinds of tasks, from simulation to computational creativity. Learn more about algorithmic random number generation... But despite their widespread use, the odds are that you're using a flawed random number generator. What's Wrong with Your Current RNG . Most random number generators in widespread use today have one of the.
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6. A pseudo-random number generator is an algorithm which produces a sequence of numbers whose properties approximate the properties of sequences of random numbers. The C language provides such a generator in its library..... rand() Function The function rand()is declared in the header filestdlib.hand provides us with the of generating pseudo-random numbers. The function returns an integer in the.
7. ed by an initial value. Statistical quality of pseudo random numbers are generally sufficient for most of practical.

### Random Number Generator Algorithm - CryptoSy

• Multiplicative Congruential Method (Lehmer Method) is a type of linear congruential generator for generating pseudorandom numbers in a specific range. This method can be defined as: where, X, the sequence of pseudo-random numbers. m ( > 0), the modulus. a (0, m), the multiplier. X0 [0, m), initial value of the sequence - termed as seed
• istic random bit generator (DRBG) is an.
• random — Generate pseudo-random numbers Class that implements the Wichmann-Hill algorithm as the core generator. Has all of the same methods as Random plus the whseed() method described below. Because this class is implemented in pure Python, it is not threadsafe and may require locks between calls. The period of the generator is 6,953,607,871,644 which is small enough to require care.

Well I need a pseudo Random Number Generation algorithm which makes the numbers repeat after a certain userdefined period. Please some one help me with the same asap since I need it very badly and soon. Tanx for all the help. Regds Gautham Kasinath P.S. Sheriffs and Bartenders please forgive my posting the message here since I didnot now where to post the same. In the country of the blind. Section 2 provides brief descriptions, pseudo code, and references for the GRNGs. Section 3 covers algorithms that focus on the tail region of the Gaussian. Section 4 describes the test parameters and the corresponding results, and Section 5 presents conclusions. 2. ALGORITHMS FOR GAUSSIAN SAMPLES In the description of different Gaussian random number generator algorithms, we as-sume the.

7. The key to this is using your own custom pseudo-random number generator that you initialize with the known seed value. The Mersenne Twister is a popular algorithm, here is the Wikipedia entry and some sample source. This, and other, PRNG algorithms actually produce a (very long) fixed series of numbers for which the seed value serves as a. In general, a systematic way to generate pseudo-random number is used to generate the random numbers used in simulation. Some algorithms are needed. We generate the uniformly distributed random numbers first; then we use this to generate random numbers of other distribution. Some desired properties of pseudo-random number generators: The routine should be fast. The routine should be portable. A first random number: 0.8492693008307766 A second random number: 0.9858307170084044. In both ways, we are using what we call a pseudo random number generator or PRNG.Indeed, whenever we call a python function, such as np.random.rand() the output can only be deterministic and cannot be truly random.Hence, numpy has to come up with a trick to generate sequences of numbers that look like random. The Mersenne Twister Pseudo Random Number Generator. posted August 19, 2014 by Stephan Brumme. Introduction The Mersenne Twister is often regarded as the fastest pseudo-random number generator which passes almost all statistical tests. The original C code isn't exactly beautiful, therefore I decided to write my own C++ class. And for the fun of it, I converted the code to Javascript and added.

pseudo random number generator, PRNG). Sie erzeugen eine Zahlenfolge, die zwar zufällig aussieht, es aber nicht ist, da sie durch einen deterministischen Algorithmus berechnet wird. Solche Pseudozufallszahlen sind von Computern wesentlich einfacher zu erzeugen und in praktisch allen höheren Programmiersprachen verfügbar Where it is possible for a programmer to set the period for a (pseudo)random number generator. Generally, it isn't. The period length is a property of the algorithm. There are some algorithms where you can choose the size of the internal state, which influences the length of the period. what defines a good (optimal or desirable) period. Long. Background: Pseudo random number generation is an algorithm for generating a stream of numbers as having the appearance of randomness.Random numbers are essential for many applications, including simulations, cryptography and random sampling. In this study, a model of Linear Feedback Shift Register is implemented in Verilog language using Xilinx software

Pseudo Random Number Generators; When to Seed the Random Number Generator; How to Control for Randomness; Common Questions; Need help with Statistics for Machine Learning? Take my free 7-day email crash course now (with sample code). Click to sign-up and also get a free PDF Ebook version of the course. Download Your FREE Mini-Course. Randomness in Machine Learning. There are many sources of. Random Number and Card Shuffling Algorithm | Coder's Cat. Random Number and Card Shuffling Algorithm. 2020-01-14. Random numbers represent uncertainty, which is widely used in the computing world. Such as encryption keys, password generation, simulation, and games. Some classic randomized algorithms (such as Monte Carlo Algorithm) also rely on. # NumPy pseudo-random generator at a fixed value import numpy as np np.random.seed(101) np.random.randint(low = 1, high = 10, size = 10) Output: Both functions work on pseudo-random generator algorithms internally. But, with the same seed value, both functions give different output starting from different random values. Conclusion . Random number generations are very crucial and important in.

random number generator to an eﬃcient permutation function (a.k.a. hash function),builtfromcomposableprimitives,thatenhancesthequalityofthe output. The algorithm can be applied at variety of bit sizes, including 64 and 128 bits (which provide 32- and 64-bit outputs, with periods of 264 and 2128). Optionally,wecanprovideeach b-bitgeneratorwitha 1bitstream-selection constant, thereby providing. Use the rand and srand Functions to Generate Random Number in C. The rand function implements a pseudo-random number generator that can provide an integer in the range of [0, RAND_MAX], where RAND_MAX is 2 31 -1 on modern systems. Note that the generator algorithm behind the rand function is deterministic. Thus it should be seeded with random bits People who are really interested in good random numbers sometimes talk about the period of a pseudo-random number generator. The period is how many numbers it picks before it starts over again and gives you back the same sequence. Our first try had a period of 10, which is rather poor. Our second try did much better: the period was 100. That's still pretty far off, though, from the random.

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