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Рандомизация — .NET (PRNG и CSPRNG)

Random с seed для симуляций и RandomNumberGenerator для криптографии.

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C# main.cs 
using System;
using System.Security.Cryptography;

var prng = new Random(42);
Console.WriteLine(prng.Next(1, 11));

Span<byte> bytes = stackalloc byte[16];
RandomNumberGenerator.Fill(bytes);
Console.WriteLine(Convert.ToHexString(bytes));
using System;
using System.Security.Cryptography;

var prng = new Random(42);
Console.WriteLine(prng.Next(1, 11));

Span<byte> bytes = stackalloc byte[16];
RandomNumberGenerator.Fill(bytes);
Console.WriteLine(Convert.ToHexString(bytes));