DAC
DAC (Discretionary Access Control) is a security model that regulates access to resources based on the identity of users or groups and permissions assigned by resource owners. It allows owners to grant or restrict access to files, directories, or other objects, typically using access control lists (ACLs) or permission bits. This model is foundational in operating systems like Unix/Linux and Windows for managing user privileges and data security.
Developers should learn DAC to implement secure access control in applications and systems, especially when building multi-user environments or handling sensitive data. It is essential for ensuring compliance with security policies, preventing unauthorized access, and designing systems that follow principle of least privilege. Use cases include file system security, database access management, and application-level permission systems.