Computer Systems Security

Access control forms the backbone of cybersecurity, ensuring that only authorized users can interact with specific resources within a system. This article provides an overview of the principles and implementation of access control, with insights from Gollmann’s chapters on Access Control, the Bell-LaPadula Model, and Security Models. What is Access Control? Access control is the […]

Access control is a cornerstone of modern computer security, ensuring that users can only interact with resources they are authorized to access. This article delves into the motivation behind access control, key access modes, Unix and Windows mechanisms, and various access control policies and implementations. Why Use Access Control? Access control is vital for system

Authorization and access control are fundamental concepts in modern cybersecurity. These mechanisms ensure that only authenticated users can access specific computer resources while enforcing policies that protect sensitive information. In this article, we will explore key aspects of authorization and access control, focusing on how these principles are applied in modern operating systems like Unix

This article continues our exploration of biometrics, focusing on liveness detection, specific biometric technologies, and how to choose the right biometric system for various applications. As biometric authentication grows in adoption, understanding its nuances is crucial for deploying secure and effective systems. What Is Liveness Detection? Liveness detection is a security feature in modern biometric

Biometric authentication is a cutting-edge approach to verifying user identities by analyzing unique personal characteristics. This article explores key biometric technologies, their applications, and the requirements for implementing secure biometric systems. As the demand for privacy and robust security measures grows, biometrics plays a pivotal role in replacing traditional authentication methods like passwords and tokens.

Introduction In the second part of this lecture, we continue our exploration of authentication by something known and something possessed. This session delves into advanced password systems, common attacks, and mitigation strategies, along with the use of physical tokens and their evolving role in secure authentication. Authentication by Something Known: Advanced Password Mechanisms Cognitive Passwords

Introduction Authentication is a cornerstone of secure computer systems. One of the most common authentication mechanisms involves something known (e.g., passwords) and something possessed (e.g., tokens). This article focuses on the use of passwords and tokens, explaining their strengths, weaknesses, and best practices for implementation in secure systems. Authentication by Something Known: Passwords Passwords are

Introduction Authentication is a core component of computer system security, closely tied to identification and accountability. Together, these processes ensure secure access to resources, enable accurate user monitoring, and maintain system integrity. This reflection explores the relationship between identification, authentication, and accountability, highlighting their practical applications in modern security frameworks. Understanding the Terminology The Relationship

Introduction Authentication is a fundamental aspect of computer security that ensures only legitimate users gain access to resources. Without it, unauthorized users could impersonate others, leading to compromised systems and data breaches. This article explores the need for authentication, its mechanisms, and its integration into secure systems, drawing insights from Gollmann’s work on identification and

Authentication is a cornerstone of computer security, ensuring that only legitimate users gain access to system resources. This process verifies the identity of users and provides a foundation for allocating system resources securely. This article delves into the need for authentication, its methods, and its role in securing modern computer systems. The Dual Role: Identification