Questions tagged [random-number-generator]

A random number generator is a software or hardware solution which functions as a generator of (real or pseudo) random numbers (or bits).

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332 views

Reusing one-time-pad with random plaintext

I understand that by definition one-time-pad keys cannot be reused but I was thinking about the case where it is used to send random data and couldn't find anything on the subject so here is my idea: ...
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1answer
127 views

How can I generate a brief (100) stream of random numbers, not using the computer or throwing dice? [closed]

I am looking for a method of making random numbers that is off-line and is also independent of specialist equipment like a Geiger counter.
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1answer
555 views

Oracle DBMS_RANDOM algorithm?

Oracle DBMS offer builtin random number generator (pseudo to be accurate). DBMS_RANDOM is one of the available packages, it is however considered as insecure for cryptography. Do we happen to know the ...
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122 views

Enhance CSPRNG output [duplicate]

If I XOR the output from 2 CSPRNG will the result be better (more random) than the output from either one? Assume one of the PRNG is biased.
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37 views

Understanding the Inner State of a RNG

Based on the BSI evaluation criteria for quality of deterministic random number generators: K4 – It should be impossible, for all practical purposes, for an attacker to calculate, or guess from an ...
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(RNG) For the Middle Square Method, is there a table of periods for various seeds?

I'm interested in the properties of the original middle square method as articulated by John von Neumann and in particular in the relation between seed value and its period length (in cases where the ...
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RNG to hide some bits

Suppose I have a sequence of bits of length M. I need to hide N out of M bits (hiding means forcing them to be 0) using RNG with a key. How I can relate the output of RNG to the number and positions ...
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Understanding a claim made by NIST SP 800-22 on the possibility of calculating $\beta$, the probability of error type 2 in a hypothesis test

NIST SP 800-22 on page 1-4 (that's page 16 of the PDF) states the following. Pay attention to the bold passages. (Emphasis are mine.) Are they true?! Can you advise? One of the primary goals of ...
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38 views

When will the random bit sequence start to repeat in pseudo random number generator

Let's say we have the Blum-Micali pseudorandom number generator. from wikipedia: Let $p$ be an odd prime, and let $g$ be a primitive root modulo $p$. Let $x_0$ be a seed, and let $x_{i+1} = g^{x_i}\ ...
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using non prime numbers in Blum Blum Shub or Blum Micali

I would like to use Blum Blum Shub, or Blum Micali methods as random number generators only. I am not interested in their encryption capabilities. I was wondering, if I replaced the prime numbers ...
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How is Pre Master Secret related to Client.random or Server.random if DH KEX is RSA

For TLS 1.2 cipher Suite AES256-GCM-SHA384, RSA is KEX(key exchagne algorithm). As per standards of RSA Diffie Hellman KEX, after 'ServerHello' message client gets server certificate and it generates ...
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Do any block cipher encryption functions (or similar functions) exist which are associative to each other and cyclic?

Most block ciphers encrypt a plaintext deterministically into a ciphertext which allows decryption in the opposite direction. Now, instead of encrypting just one plaintext, I'm looking for a cyclic '...
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33 views

Help, Feedback and Solutions to a problem on a PoC CSPRNG

Background I do not recommend trying to roll your own crypto. This is just a for-fun PoC, which won't be used in any public or private scenario. I am creating a PoC nearly-true random number ...
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260 views

Set passes Dieharder randomness with ints values, fails when ints are split into bytes

I've generated 100M of random numbers in range (0..255). These numbers fail Dieharder tasts (bitnum = 8). However, I can pass this test by combining four bytes into an int. Randomness of the set didn'...
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272 views

How to get unknown constants from linear congruential generator

I need to crack this linear congruential generator. I have $$X_{n+1}=a⋅X_n +b \pmod m$$ I know: $m=31,X_3=30,X_4=19,X_5=26$ How can I find $a,b$ and $X_0$? I have got already the following ...
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7k views

How to calculate the probability to get two random numbers equal from the same generator

I have deterministic random bit generator (DRBG) to generate a random numbers in which it is 10 byte value and I want to turn this algorithm twice, what is the probability to get the two random equal ...
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1answer
196 views

Shuffleless PRNG function with non-repeating values?

I need a simple PRNG function of type: Integer = PRNG(n, maxval) as I would like to count from 0 to maxval, not in a linear manner, but in a pseudorandom manner where I still use every value, but ...
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1answer
160 views

Issue about randomness : what if random looks “human” ? [closed]

I read a lot of stuffs about entropy/randomness. But what if a random generator (either digits or strings) once output a "human" patern ? I know it is very unlikely to happen, but if a random code ...
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1answer
187 views

Which is the longest CSPRNG?

There are some PRNGs considered cryptographically secure. Which has the longest period among them?
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1answer
106 views

What's wrong with this “order-preserving MAC” function?

Please note: this is purely a thought experiment and not intended for any real-world usage! I came up with a simple function $\mathrm{OPF}$ to map the integers $[0,C)$ (where $C$ is the "ChunkSize") ...
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1answer
67 views

Is a number generator based on hashing an incremental string and a seed considered random? Part 2

Sorry I didn't put enough details on my last question, I didn't expect that there is really lots of factors, so most answers were left for speculations. In this question, I will give the scenario I am ...
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1answer
238 views

Brute forcing/hacking Secure passphrases - difficulty for random strings vs real words

I was wondering about this topic of brute forcing passwords,or ANY other way to deriving them - and asking myself whats more secure (relatively): A Password which includes A) 30 digits length- a ...
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2answers
113 views

Improving on a clocked PRNG

I recently developed a PRNG from scratch with a little inspiration from the initialization function used in the HC stream cipher. The state ($S$) of the basic version is an array of 5 bytes and uses ...
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1answer
263 views

Random number generator in a 2p2 Network

for my thesis I am trying to develop a system where nodes from a peer to peer network agree in generate a random number every tot seconds. I am stocked in this problem since almost 1 week anyone can ...
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Why are there so many stream ciphers out there and even ongoing research?

What make them better than OTP using a CSPRNG initialized with a secret key?
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1answer
5k views

How to calculate entropy of a random number?

I am having a set of random numbers and I want to calculate entropy of them. I searched many entropy calculation formula, but I didn't get it. Can you elaborate a little bit?
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675 views

Is it possible to attack an SHA-256 hash seeded with PHP’s mt_rand function?

Is it possible to attack this construction if the attacker only knows the hash? ...
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1answer
61 views

Method for generating random number(s) [closed]

I was reading about random numbers and their usage in security. I'd like to verify with more experienced people how good this method of generating random numbers will be. Human beings are very hard ...
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1answer
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Given a point $c$ in a field $Z_p$. Can we get another value $c^{'}$ such that $\left(c^{\prime}-c\right)$ is invertible in $Z_p$?

If we have a point in a field $c$. Can we get another value $c^{'}$ such that $\left(c^{\prime}-c\right)$ is invertible in $Z_p$ ?
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Is it interesting to design stream ciphers parametrized by a CSPRNG?

Would it be interesting to have new stream ciphers whose design is parametrized by a CSPRNG? I.e. to instantiate the stream cipher, you just have to select and plug in any CSPRNG of your choice.
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1answer
482 views

simple encrypt/decrypt [closed]

I would like to encrypt a file by XORing the source message with a prng of my own. The prng is streaming a flow of sha512 hashes. Each hash is produced from the previous hash plus constant string plus ...
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IV's from Crypto++ AutoSeededRNG always ends the same: Problem with the PRNG? [closed]

I am using a AutoSeededRNG from Crypto++ to generate IVs for use in CBC encryption. I am encoding the IVs using Base64 for future use (decryption). I notice that ...
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128-bit Pseudorandom number Generator

Is there any 128-bit pseudorandom number generator available? I tried the Blum Blum Shub Generator, but I can't produce a 128-bit pseudo-random number. Maybe before I produce a 128-bit pseudorandom ...

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