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Hardening refers to providing various means of protection in a computer system. Protection is provided in various layers and is often referred to as defense in depth. Protecting in layers means to protect at the host level, the application level, the operating system level, the user level, the physical level and all the sublevels in between. Each level requires a unique method of security.
A hardened computer system is a more secure computer system.
Hardening is also known as system hardening.
Hardening’s goal is to eliminate as many risks and threats to a computer system as necessary. Hardening activities for a computer system can include: