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byte[] randomBytes = new byte[128];
SecureRandom random = new SecureRandom();
random.nextBytes(randomBytes);

It is also good practice to specify Specifying the exact random number generator RNG algorithm and provider for better portabilitycan improve portability, perhaps when complying with a design or regulation that mandates a particular algorithm. However, if no arguments are provided, the constructor will provide a default secure RNG.

Applicability

Insufficiently secure random numbers enable attackers to gain specific information about the context in which they are used.

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