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Questions tagged [secure-random]

SecureRandom is a Java class that provides a cryptographically strong random number generator (RNG).

SecureRandom is a Java class that provides a cryptographically strong random number generator (RNG).

A cryptographically strong random number minimally complies with the statistical random number generator tests specified in FIPS 140-2, Security Requirements for Cryptographic Modules, section 4.9.1. Additionally, SecureRandom must produce non-deterministic output. Therefore any seed material passed to a SecureRandom object must be unpredictable, and all SecureRandom output sequences must be cryptographically strong, as described in RFC 1750: Randomness Recommendations for Security.

http://docs.oracle.com/javase/7/docs/api/java/security/SecureRandom.html

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Why does the BigInteger.isProbablePrime() function in Java return true for negative numbers?

I am implementing the RSA public-key cryptographic algorithm in Java. It requires generating two random prime numbers. I have been using the SecureRandom class to generate two 1024 bit numbers to create a 2048 bit key. I handle the numbers using the…
user7187118
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Generate Random String in java

I'm trying to generate a string between capital A-Z in java using Secure Random. Currently I'm able to generate an alphanumeric string with special characters but I want a string with only upper case alphabets. public String createRandomCode(int…
Lucy
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Generating random numbers in a particular range

I am trying to generate n random numbers between 0-31 in my Android code. Below is the code that I am using: int max_range = 31; SecureRandom secureRandom = new SecureRandom(); int[] digestCodeIndicesArr = new int[indices_length]; int i = 0,…
Sid
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How to create a random output of a certain bit size in Java?

I want to create a random alpha-numeric string whose bit count will always be of size k. The size k will be something relatively big (varying from 128 to 2048 or more). I'm reading this excellent thread and I'm trying to figure something out using…
Aventinus
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Is it guaranteed that 2 sequential calls to secure random will give different numbers?

Using SecureRandom is there a guarantee that 2 sequential calls will not return the same number? If this is a strict requirement from client API side, is the following loop in the code redundant or not? Random random =…
Cratylus
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How to properly use SecureRandom 12 digit number?

I am trying to create a random number use SecureRandom. It must be digits only (0123456789) and be 12 characters long. Any help would be greatly appreciated. SecureRandom secureRandom = new SecureRandom(); synchronized (secureRandom) { …
newPHPDev
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How to implement RSA based on custom user defined padding -JAVA

Im trying to implement RSA based on custom padding value. cipher.init(ENCRYPT_MODE, publicKey,oaepParameter, secureRandom); I would like to change the secureRandom function to somthing else. Basically like to feed custom defined byte[] (could be…
DAN
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How to use SecureRandom instead of using hardcoded bytes array for Java AES Encrytion and Decryption?

In my code I am using hardcoded arrays(given below) for IV and key **private static byte[] IVAes = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16 }; private static byte[] keyAes = { 0x01, 0x02,…
Pragya S
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how much reliable the Unique Id generated using SecureRandom

I need to obtain unique primary which is less than 24 char length, I have tried using SecureRandom and i read its documentation says A cryptographically strong random number. is this Reliable ? all I need to have Alphanumeric with max of 24 char…
jcrshankar
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RandomUUID in UUID operators code explanation

I'm looking to understand the following operators &= 0x0f /* clear version */ |= 0x40 /* set to version 4 */ &= 0x3f /* clear variant */ |= 0x80. /* set to IETF variant */ Found in the following code UUID native java…
Robbo_UK
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Java SecureRandom Instance SHA1PRNG equivalent in Node.JS/

I need to translate a function in Java to Node JS public byte[] GetId() throws NoSuchAlgorithmException { byte[] byArray = new byte[4]; byte[] byArray2 = new byte[8]; SecureRandom secureRandom =…
rafaelpolonio
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How to access SecureRandom in jsbn typescript?

I used to access the SecureRandom in jsbn.js this way var jsbn = require('jsbn'); var SecureRandom = jsbn.SecureRandom; var secureRandom = new SecureRandom(); secureRandom.nextBytes(x); How do I access it in jsbn.ts? As there seem to be limited…
Sithideth Bouasavanh
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SecureRandom is not working as expected in docker adoptopenjdk-tomcat image

I am using docker image of tomcat to run the application. The image details are: tomcat:9.0.45-jdk11-adoptopenjdk-hotspot. When I run the application on my local machine where I have jdk11-adoptopenjdk installed the application working fine but same…
Atul
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Generating unique random values with SecureRandom

i'm currently implementing a secret sharing scheme.(shamir) In order to generate some secret shares, I need to generate some random numbers within a range. FOr this purpose, I have this very simple code: val sharesPRG = SecureRandom() fun…
crypto_confuse
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How to generate a SecureRandom number with a specific bit range

I have maximum number of bits that is not bit aligned E.g. 35 and required to generate unique random number from 1 - 68719476734 (max number for 35 bits). Could use SecureRandom but will have to extract 5 bytes out of it and convert to Long maybe,…
user964287
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