Cryptography is a method of protecting information and communications through the use of codes, so that only those for whom the information is intended can read and process it.
Spyware is a type of malicious software -- or malware -- that is installed on a computing device without the end user's knowledge. It invades the device, steals sensitive information and internet usage data, and relays it to advertisers, data firms or external users.
A firewall is a type of cybersecurity tool that is used to filter traffic on a network. Firewalls can be used to separate network nodes from external traffic sources, internal traffic sources, or even specific applications.
Stalking can be defined as the willful and repeated following, watching or harassing of another person. Unlike other crimes, which usually involve one act, stalking is a series of actions that occur over a period of time.