The FREE Cybersecurity Glossary by Thor Pedersen!

Enumeration: A process used in the reconnaissance or pre-attack phase where a potential attacker interacts with a system to gather information that could be useful for exploiting it. This may involve determining a user's valid email address, network resources, shared directories, IP addresses in use, or even detailed user account information in certain circumstances.

Environment: In general terms, an environment refers to the surrounding conditions or context in which an organism, system, or object operates. In computing, an environment is the setting in which a computer program or software application runs – it's about the hardware, operating system, software libraries, and data that exist outside the program itself. The term is also used to describe the configuration of software or hardware tools to create a specific type of runtime environment, such as a development, test, or production environment. Each environment serves a particular purpose in the software development lifecycle and operates under different parameters.

Environmental Monitoring: The process of continuously observing and analyzing the conditions of a specific setting to ensure optimal performance and detect any potential issues that could affect system operations or data integrity. This includes tracking parameters like temperature, humidity, power supply, water leaks, or even unauthorized access, which can be crucial for maintaining the proper functioning of sensitive equipment like servers in a data center.

Ephemeral Key: A cryptographic key that is used only once or for a brief period of time before being discarded. It is typically employed in secure communications to ensure the confidentiality and integrity of each individual session. The use of ephemeral keys enhances security by ensuring that even if a key is compromised, it can't be used to decrypt other sessions or gain long-term access to sensitive information.

Ephemeral Storage: Temporary data storage that is not persistent across reboots or termination of the instance. It is often used in cloud computing environments for temporary storage of information such as swap files, buffers, or session data. Data stored in ephemeral storage is typically lost once the instance is stopped, terminated, or crashes, making it unsuitable for long-term data retention but useful for transient data and applications that do not require durable storage.

ePHI (Electronic Protected Health Information): Any Protected Health Information (PHI) that is created, stored, transmitted, or received in an electronic form. Under laws such as the Health Insurance Portability and Accountability Act (HIPAA), ePHI must be kept confidential and secure to protect patients' privacy. This often involves the use of encryption, secure networks, and robust access controls.