The FREE Cybersecurity Glossary by Thor Pedersen!

Register: A register is a small, high-speed storage area within a computer's processor designed to hold and quickly access data needed for computation. Each processor core contains multiple registers, which temporarily store specific types of data, like instruction operands, addresses, and control information. They play a crucial role in the overall system performance, acting as a bridge between memory and the processing unit for rapid data access.

Registered ports: Port numbers ranging from 1024 to 49151 that are reserved for specific well-known services in networking. Examples include HTTP on port 80, HTTPS on port 443, SMTP on port 25, DNS on port 53, and RDP on port 3389.

Registration Authority (RA): A trusted entity responsible for verifying the identity of individuals or organizations and issuing digital certificates. It plays a critical role in public key infrastructure (PKI) to establish trust and secure communication. Examples include a Certificate Authority (CA) that verifies a user's identity before issuing a digital certificate or an RA that verifies an organization's identity before issuing an SSL certificate.

Regression testing: The process of testing a software application after changes have been made to ensure that the changes have not introduced new defects or broken existing functionality. It is commonly used in software development to verify the stability and reliability of a system. Examples include running a suite of automated test cases after a code update or manually testing specific features after a bug fix.

Regulation: A rule or directive issued by a government agency to control or influence an industry or activity, aimed at protecting the public interest and ensuring compliance with standards. Examples include HIPAA, which governs the use and disclosure of personal health information, and PCI DSS, setting standards for payment card data security.

Regulatory policy (in IT and Cybersecurity): Guidelines and practices that govern how organizations comply with laws and regulations related to information technology and data security. These policies help ensure that organizations meet specific industry standards, like GDPR for data protection and Sarbanes-Oxley for financial reporting, to protect consumer data and maintain privacy.