The FREE Cybersecurity Glossary by Thor Pedersen!

Homomorphic: A term used in the context of encryption that refers to the ability to perform computations on encrypted data without decrypting it first. Homomorphic encryption allows for the processing of data while maintaining its ciphertext form, ensuring that the data remains secure even in untrusted environments. Once the computation is performed, the results are also in an encrypted form and can be decrypted only with the appropriate key. This property is particularly valuable for privacy-preserving data analysis and cloud computing, where sensitive data can be processed by external servers without exposing the underlying data to those servers. Homomorphic encryption is an active area of research and can be partial, somewhat, or fully homomorphic, depending on the types and complexity of operations it supports.

Honeynet: A network of computers that is intentionally exposed to the Internet to lure attackers and study their methods, used in security research and incident response. Examples include the Honeynet Project and the Honeypot Project.

Honeypot: A security mechanism set up to detect, deflect, or study hacking attempts. It is designed to appear as a legitimate part of the network but is isolated and monitored to capture unauthorized access attempts or understand an attacker's techniques.

Horizontal defense-in-depth: Horizontal defense-in-depth encompasses the implementation of security measures at the same network layer to create a multi-faceted barrier to threats. It involves using a variety of tools and techniques at a particular point in the network architecture, such that an attacker breaching one control encounters another.

Host: A computer or other device connected to a network that provides data, services, or resources to clients. In network architecture, hosts can serve as servers, offering web pages, applications, or storage, and enable users to access and utilize these resources.

Host-Based Firewalls: Security software installed on individual hosts or servers that controls the incoming and outgoing network traffic based on predetermined security rules. Host-based firewalls protect against unauthorized access and can provide tailored security at the host level.