Consider contributing this to .NET BCL

[macsux]

Wanted to see if this is something that should possibly worth persuing as contrib to core .NET itself rather then standalone lib.

[sdrapkin]

@macsux Unfortunately it is very unlikely to be merged into core .NET. Microsoft has decided to maintain backward compatibility, and will keep old broken implementation (.NET 5 and below) for all seeded invocations of System.Random in .NET 6. Microsoft's approach to unseeded implementation in .NET 6 is also different - they've decided to implement xoshiro256** algorithm, which is faster than legacy implementation, but Microsoft's approach to thread-safety (Random.Shared) is also deficient. Microsoft uses thread-static instances which never use full 2^256 period as designed.

CryptoRandom approach is different - it takes the approach that cryptographically strong randomness is the best kind of randomness (whether seeded or unseeded). Users should not be experts to know where/when they need cryptographic randomness vs. "lesser kind" of randomness. The randomness provided should just be high-quality at all times for all purposes.