values that depends only on the initial seed given. An example would be a linear congruential generator like PM88. Thus, knowing even a short sequence of generated values it is possible to figure out the seed that was used and thus - know the next value the number randomizer will generate...
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Java provides an option for explicitly seeding a secure randomizer. It's used mainly when you need to re-seed a randomizer object (to supplement existing seeding), but never for initial seeding. There are various situations in which a re-seeding is mandatory, for example, generating nonces, I...