That's not the case here, and even then why bother when modern operating systems have ways to easily get you good quality entropy? If you use a decent random li

That's not the case here, and even then why bother when modern operating systems have ways to easily get you good quality entropy? If you use a decent random library you won't have to bother reinventing the wheel. I had to generate a 20 char random key string in Rust the other day, I just wrote: rand::thread_rng() .sample_iter(&Alphanumeric) .take(20) .map(char::from) .collect() There. Uniform, decent entropy, explicit, simple.