# Protection in Operating Systems
## Official Documentation
- **SELinux Project**
  - [Link](https://github.com/SELinuxProject/selinux)
- **AppArmor Documentation**
  - [Link](https://gitlab.com/apparmor/apparmor/-/wikis/home)
- **Windows Security Documentation**
  - [Link](https://docs.microsoft.com/en-us/windows/security/)
- **Linux Kernel Security Documentation**
  - [Link](https://www.kernel.org/doc/html/latest/security/index.html)

## Research Papers
- **"A Comparison of Secure Multi-tenancy Architectures for Filesystem Storage Clouds" by M. Factor et al. (2013)**
  - [Link](https://ieeexplore.ieee.org/document/6365700)
- **"Secure Virtual Architecture: A Safe Execution Environment for Commodity Operating Systems" by J. Criswell et al. (2007)**
  - [Link](https://dl.acm.org/doi/10.1145/1294261.1294295)
- **"TRESOR Runs Encryption Securely Outside RAM" by T. Müller et al. (2011)**
  - [Link](https://www.usenix.org/conference/usenixsecurity11/tresor-runs-encryption-securely-outside-ram)

## Additional Online Resources
- **The Linux Security Module Framework**
  - [Link](https://www.kernel.org/doc/html/latest/security/lsm.html)
- **OpenBSD Security Features**
  - [Link](https://www.openbsd.org/security.html)
- **Qubes OS: A reasonably secure operating system**
  - [Link](https://www.qubes-os.org/)

## Books
- **"Operating System Security" by Trent Jaeger**
  - ISBN: 1598292129
  - Provides a comprehensive overview of security in operating systems.
- **"Linux Security Cookbook" by Daniel J. Barrett, Richard E. Silverman, and Robert G. Byrnes**
  - ISBN: 0596003919
  - Offers practical solutions for enhancing Linux system security.
- **"Windows Internals, Part 1" by Pavel Yosifovich, Alex Ionescu, Mark E. Russinovich, and David A. Solomon**
  - ISBN: 0735684189
  - Covers the internals of Windows operating systems, including security mechanisms.
- **"The Design and Implementation of the FreeBSD Operating System" by Marshall Kirk McKusick, George V. Neville-Neil, and Robert N.M. Watson**
  - ISBN: 0321968972
  - Includes detailed information on FreeBSD's security features and implementation.

## Standards
- **Common Criteria for Information Technology Security Evaluation (ISO/IEC 15408)**
  - International standard for computer security certification
- **NIST Special Publication 800-123: Guide to General Server Security**
  - [Link](https://csrc.nist.gov/publications/detail/sp/800-123/final)

## Online Courses
- **Coursera: Operating Systems Security by University of Colorado**
  - [Link](https://www.coursera.org/learn/os-security)
- **edX: Computer Systems Security**
  - [Link](https://www.edx.org/course/computer-systems-security)
- **Udacity: Security in Computing Systems**
  - [Link](https://www.udacity.com/course/security-in-computing-systems--ud995)