Malware is exploding (see chart 2). It is typically used to steal passwords and other data, or to open a "back door" to a computer so that it can be taken over by outsiders.
3
这些“后门”本是用销售公司的技术人员为了更新运行软件而留下的密码。
These are passwords used by technicians from firms that sell the devices to update the software that runs them.