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What matters is entropy. What makes a PRNG cryptographically secure is the inability of attackers to predict the next bytes. Precisely, there are three "security levels" that define the security, in the following model: The attacker is given s bits of consecutive output from the PRNG. The attacker's computing abilities are limited to 2k elementary ...


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What should be the size of the seed that I initialize a CSPRNG with? Seed Length and other requirements for approved block cipher algorithms are summarized here: How often should I reseed it? The seed is secure as long as it remains unknown to the attacker. I think I can not explain better than this answer. CSPNRG entropy is calculated using ...


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This certification is typically done through FIPS certification. The list of labs certified by NIST to perform FIPS certifications is here



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