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As the title says: What is the difference between a non-secure random number generator and a secure random number generator?
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Size: A Random class has only 48 bits whereas SecureRandom can have up to 128 bits. So the chances of repeating in SecureRandom are smaller. Seed Generation: Random uses the system clock as the seed/or to generate the seed.
The difference between PRNG and TRNG is deterministic, PRNG is a deterministic random number generator, and TRNG is a non-deterministic random number generator. PRNG generates a long-length random number using algo- rithms based on a short initial value.
There are generally two kinds of random number generators: non-deterministic random number generators, sometimes called "true random number generators" (TRNG), and deterministic random number generators, also called pseudorandom number generators (PRNG).
A cryptographically secure pseudo random number generator (CSPRNG), is one where the number that is generated is extremely hard for any third party to predict what it might be.
No computationally feasible algorithm should:
for a secure random number generator.
Example: a linear feedback shift register produces lots of random numbers out there, but given enough output, the seed can be discovered and all subsequent numbers predicted.
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