# Graham-Denning model

> computer security model

**Wikidata**: [Q3318075](https://www.wikidata.org/wiki/Q3318075)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Graham–Denning_model)  
**Source**: https://4ort.xyz/entity/graham-denning-model

## Summary
The Graham-Denning model is a computer security model designed to specify and enforce security policies. It is one of several formal models used in computer security to define access rights and control mechanisms.

## Key Facts
- Instance of: computer security model
- Aliases: Graham–Denning model, Modèle de graham-denning, Modele de Graham-Denning
- Freebase ID: /m/08l8xg
- Wikipedia title: Graham–Denning model
- Available in 4 languages: English, French, Russian, Ukrainian
- Wikidata description: computer security model
- Sitelink count: 4

## FAQs
### Q: What is the Graham-Denning model?
A: The Graham-Denning model is a computer security model that provides a formal framework for specifying and enforcing security policies. It defines a set of basic operations for managing access rights in a secure system.

### Q: How does the Graham-Denning model work?
A: The Graham-Denning model works by defining a set of primitive operations that can be used to create, delete, and modify access rights between subjects and objects in a computer system. These operations form the basis for implementing security policies.

### Q: What are the key components of the Graham-Denning model?
A: The key components of the Graham-Denning model include subjects (active entities like users or processes), objects (passive entities like files or devices), and a set of primitive operations for managing access rights between them.

## Why It Matters
The Graham-Denning model is significant in the field of computer security as it provides a formal foundation for understanding and implementing access control mechanisms. By defining a set of primitive operations for managing access rights, it offers a structured approach to enforcing security policies in computer systems. This model has influenced the development of various access control systems and has contributed to the theoretical understanding of computer security. Its importance lies in its ability to provide a clear framework for thinking about and implementing security policies, which is crucial in protecting sensitive information and maintaining system integrity in an increasingly digital world.

## Notable For
- Being one of the foundational formal models in computer security
- Providing a set of primitive operations for access control
- Influencing the development of access control mechanisms in operating systems
- Offering a theoretical framework for understanding security policies
- Contributing to the academic study of computer security

## Body
### Overview
The Graham-Denning model is a formal computer security model that provides a framework for specifying and enforcing security policies. It was developed to address the need for a structured approach to access control in computer systems.

### Key Concepts
The model is based on the concept of subjects and objects, where subjects are active entities (like users or processes) and objects are passive entities (like files or devices). The model defines a set of primitive operations that can be performed on these subjects and objects to manage access rights.

### Primitive Operations
The Graham-Denning model defines eight primitive operations:
1. Create a subject
2. Create an object
3. Delete a subject
4. Delete an object
5. Read access rights
6. Grant access rights
7. Delete access rights
8. Transfer access rights

These operations form the basis for implementing security policies in a system that follows the Graham-Denning model.

### Applications
The model has been influential in the design of various access control systems and has contributed to the theoretical understanding of computer security. It provides a foundation for thinking about and implementing security policies in a structured manner.

### Limitations
While the Graham-Denning model provides a solid theoretical foundation, it has some limitations in practical applications. For instance, it does not directly address issues like revocation of access rights or the delegation of authority, which are important considerations in real-world security systems.