string c = ""; const string glyphs= "abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()_-=+]}[{;:'/?.><,|`~"; //add the characters you want int minCharAmount = 8; //minimuim length of your string int maxCharAmount = 12; //maximium length of your string int charAmount = Random.Range(minCharAmount, maxCharAmount); for(int i=0; i<charAmount; i++) { c += glyphs[Random.Range(0, glyphs.Length)]; }