I tried SecureRandom.random_number(9**6) but it sometimes returns 5 and sometimes 6 numbers. I'd want it to be a length of 6 consistently. I would also prefer it in the format like SecureRandom.ran...

A java application does something like this: SecureRandom random = new SecureRandom(); for(int i=0;i<12;i++){ random.nextInt(19); } At random.nextInt() the java freezes for several minutes, se...

I am trying to understand the advantages of using UUID.randomUUID() over SecureRandom generator as the former uses securerandom internally.

Java 9 (JSR 379) introduces the NIST DRBG's as specified in JEP 273: DRBG-Based SecureRandom Implementations. However, the NIST document SP 800-90Ar1 (NIST Special Publication 800-90A Revision 1: R...

Java 9 introduced a new SecureRandom called DRBG. I want to use it to deterministically generate random numbers. The problem is that it uses a nonce internally which it always changes, so I don't g...

I have read that, generally, some implementations of SecureRandom may produce true random numbers. In particular, the Android docs say instances of this class will generate an initial seed usin...

There are a lot of questions asking if a specific initiation of SecureRandom is "good", but I couldn't find a rule of thumb. What's the best way to create a "good" random SecureRandom? // Fast //...

The title pretty much summarizes it - we can create one instance of java.util.Random (or SecureRandom) and use it every time we need a random value or we can create a new instance every time on dem...

I'm generating a random string using: private String generateSafeToken() { SecureRandom random = new SecureRandom(); byte bytes[] = new byte[512]; random.nextBytes(bytes); return bytes.t...

Users can purchase a "Pro" version of my app. When they do, I store and verify their purchase as follows. Combine the user's UUID and another unique string. The resulting string is then encrypted...