Many cyber attacks begin by sending emails to targets. These messages attempt to gain the trust of the recipient who may disclose personal information that is of use to the attackers. However, their low rate of success means that attackers are increasingly targeting their messages in what is known as Blank $2$ Question $36.$ If their initial attack is successful, criminals may gain access to the computer over a long period of time; this is called a Blank $3$ Question $36.$ A Blank $4$ Question $36$ is one of the tools often used by hackers; it appears to be an innocent program such as a screensaver or application, but it can be used to steal data or obtain access to the computer.