Fill in the blanks:

1. A ________ is similar to a ________, except that it is a program rather than a code segment hidden in a host program.
2. Wally Hewitt is an accountant with a large accounting firm. The firm has a very strict policy of requiring all users to change their passwords every sixty days. In early March, Wally received an email from the firm that explained that there had been an error updating his password and that provided a link to a Web site with instructions for re-entering his password. Something about the email made Wally suspicious, so he called the firm's information technology department and found that the email was fictitious. The email was an example of__________.
3. Developers of computer systems often include a user name and password that is hidden in the system, just in case they need to get into the system and correct problems in the future. This is referred to as a__________.
4. In the 1960s, techniques were developed that allowed individuals to fool the phone system into providing free access to long distance phone calls. The people who use these methods are referred to as__________.
5. During a routine audit, a review of cash receipts and related accounting entries revealed discrepancies. Upon further analysis, it was found that figures had been entered correctly and then subsequently changed, with the difference diverted to a fictitious customer account. This is an example of__________.