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ToBase64String buf ;. Stefan Stefan Approach 1 Support for ranges that are no bigger than But it can fall back to approach 2 which is a little slower One byte is always used per value. After truncation beyond the exclusiveLimit the modulus remains perfectly balanced Using a bitmask instead of modulus is a slower approach EG.

There is 1 value that must be discarded [], otherwise the modulus will be fine. WriteLine sb. ToString ; Console. Max can be supported Treat RNGCryptoServiceProvider bytes as a bitstream Calculate the base2 bit length needed per number Take the next number from the random bitstream If that number is still greater than the desired range, discard Results: See the repository for the latest results from the test harness Both approaches appear to have a suitably balanced distribution of numbers Approach 1 is faster [ms] but it only works on individual bytes.

Approach 2 is a little slower [ms] than Approach 1, but it works across byte boundaries. It discards fewer bits, which can be useful if the random stream input becomes a bottleneck different algorithm for example. A hybrid of both approaches gives the best of both worlds: better speed when the byte range is , support for ranges beyond but a bit slower.

Kind Contributor Kind Contributor Ah, found it: stackoverflow. Please let me know. Any update to this? Does throwing away values over the exclusiveLimit prevent bias? Robula see bitbucket. The algorithm that I had before appeared to have a bias. I updated it with a more stable algorithm. Robula I have updated my answer. The original algorithm was stable, but now I also have a fallback algorithm for when the desired number range is greater than Concat Enumerable. MaxValue ; return new string randomByte.

Skip 1. Take secretLength. Soroush Falahati Soroush Falahati 1, 1 1 gold badge 25 25 silver badges 36 36 bronze badges. ToChar ascii3 ; sb. Append karakter1 ; sb. Append karakter2 ; sb. Hello, please provide comment to explain your answer; thank you!

Using a character array in such software is not the right approach. GetBytes randomBytes ; return BitConverter. Sludgedog Sludgedog 53 7 7 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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Question feed. Contents Exit focus mode. Get Bytes Method Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System. Cryptography Assembly: System. GetBytes Byte[]. Fills an array of bytes with a cryptographically strong sequence of random values.

Applies to. Fills a span with cryptographically strong random bytes. GetBytes Byte[], Int32, Int

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