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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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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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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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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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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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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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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122 views

Does watching Youtube generate entrophy

Does watching videos (either online videos such as off youtube or saved locally) generate enough (if any) entropy to create secure encryption keys? I understand that some activities such as memory ...
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Random number generator in C++ [closed]

I've wrote a simple random number generater in C++. Simply, I thought, the random things in software. I wrote it based on below: When an object is created on the stack, its address is random. The ...
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216 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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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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202 views

Which is the longest CSPRNG?

There are some PRNGs considered cryptographically secure. Which has the longest period among them?
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112 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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75 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
399 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
122 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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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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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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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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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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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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486 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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