# File lib/action_controller/http_authentication.rb, line 291
      def validate_nonce(request, value, seconds_to_timeout=5*60)
        return false if value.nil?
        t = Base64.decode64(value).split(":").first.to_i
        nonce(t) == value && (t - Time.now.to_i).abs <= seconds_to_timeout
      end