1. Worms:
   1. Programs that infect other software or files. They require an executable (a running program) to spread, attaching to other executables.
   2. Programs that take advantage of security vulnerability to automatically spread, and to do so without requiring an executable.
   3. Exploits that masquerade as something theyre not i.e., their payload is released when the user is duped into downloading and installing the malware cargo.
   4. Malware that encrypts a users files (sometimes threatening to delete them), with demands that a user pay to regain control of their data and/or device.
2. Ransomware:
   1. Software the surreptitiously monitors user actions or network traffic, or scans for files.
   2. Programs installed with full user consent or knowledge that later serve up unwanted advertisements.
   3. Malware that encrypts a users files (perhaps threatening to delete them), with demands that a user pay to regain control of their data and/or their activities.
   4. A type of spyware that records user keystrokes.
3. Which of the following is true?
   1. Public key encryption (PKE) is a one-key system used for securing electronic transmission.
   2. Phishing techniques attempt to trick or con individuals into providing information.
   3. Shoulder surfing is gaining confidential information through observation.
   4. A work is a program that infects other software or files. It requires an executable to sprea
4. Distributed Denial of Service (DDoS) Attack:
   1. An attack where a firms computer systems are flooded with thousands of seemingly legitimate requests, the sheer volume of which will slow or shut down the users site.
   2. A con executed using technology typically targeted at acquiring sensitive information or tricking someone into installing malicious software.
   3. An attack that is so new it hasnt been clearly identified, and consequently, hasnt made it into security screening systems.
   4. A test to discern computers and humans apart from one another (as regards attempted access to a system).