db = Hash.new

db['xxx'] = 'yyy'
db['yyy'] = 'zzz'



done = false
while not done

		print 'Enter Username :'
		username = gets.chomp

		print 'Enter Password :'
		password = gets.chomp


		if db[username] == password
			print 'Autentication SucessFull'
			done = true;
		else
			print 'Invalid Credentials'
			puts
			print 'press q to quit or any other key to continue'
			choice = gets.chomp

			if choice.downcase == 'q'
				done = true;
			else
				done = false;
			end
		end


	end