Random symbol generator

math.randomseed(os.clock()^math.random(1, 5))

local character_set = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890аәӕбвгґғҕдԁђԃҙеєжҗзԅѕӡԇиҋіјкқӄҡҟҝлӆљԉмӎнӊңӈҥњԋоөпҧҁрҏсԍҫтԏҭћуүұѹфхҳһѡѿѽѻцҵчҷӌҹҽҿџшщъыьҍѣэюяѥѧѫѩѭѯѱѳѵҩӀӀ۱۲۳۴۵۶۷۸۹ءٴٲٱٳاٮبٻپڀةتثٹٺټٽٿجڃڄچڿڇحخځڂڅدذڈډڊڋڌڍڎڏڐرزڑڒړڔڕږڗژڙسشښڛڜۺصضڝڞۻطظڟعغڠۼفڡڢڣڤڥڦٯقڧڨكکڪګڬڭڮگڰڱڲڳڴلڵڶڷڸمنںڻڼڽڹهھہۃەوۥۄۅۆۇۈۉۊۋۏىيۦیۍێېۑے"
local character_set_amount = #character_set
local number_one = 1
local default_length = 10

local function generate_key(length)
	local random_string = {}

	for int = number_one, length or default_length do
		local random_number = math.random(number_one, character_set_amount)
		local character = string.sub(character_set, random_number, random_number)

		random_string[#random_string + number_one] = character
	end

	return table.concat(random_string)
end

generate_key()