I’ve seen many Linux admins struggle with managing public keys for SSH access - it’s a real pain. That’s where SSH certificates come in. They offer a more secure and convenient way to access your servers compared to traditional password-based authentication or even public key authentication. By using SSH certificates, you can eliminate the need to manage and distribute public keys, simplify user access management, and enhance security.
[Read More]As a Linux user, you’re probably no stranger to Secure Shell (SSH) and its importance in securely accessing remote servers. With the rise of SSH server certificates, I’ve seen this go wrong when not properly verified - it’s crucial to ensure the authenticity and integrity of your SSH connections. In this article, we’ll explore how to use OpenSSL to verify SSH server certificates on Linux clients.
[Read More]I’ve seen many Linux systems compromised due to weak SSH security, so I want to share my approach to hardening SSH access. As of 2026, SSH remains a vital tool for system administration, development, and self-hosting, but its widespread use also makes it a common target for brute-force attacks and unauthorized access attempts. To mitigate these risks, I recommend using Fail2Ban and Public Key Authentication to secure SSH on Debian-based systems.
[Read More]I’ve seen many Linux admins struggle with managing SSH keys for their users. OpenSSH certificates are a game-changer here - they offer a more secure and convenient way to manage access to your Linux servers. By using certificates, you can avoid the hassle of managing individual SSH keys for each user and reduce the risk of key compromise.
To get started with OpenSSH certificates, you need to set up a Certificate Authority (CA). The CA will be used to sign and verify the certificates. I usually start with generating a CA key pair using the following command:
[Read More]Securing your SSH server is one of the most critical tasks as a Linux administrator. I’ve seen this go wrong when systems are left vulnerable to unauthorized access. The recent high-profile vulnerabilities discovered in popular SSH implementations in 2025 serve as a reminder to keep your SSH server up to date and configured securely. In this article, we’ll discuss practical steps to harden your SSH server without making it overly restrictive.
[Read More]As we continue to navigate the complex landscape of Linux security in 2026, it’s essential to reflect on the advancements made in 2025 and how they’ve impacted our approach to secure boot and UEFI firmware security. In this blog post, we’ll delve into the latest trends, best practices, and potential vulnerabilities to ensure a robust and secure boot process.
Secure boot is a critical component of modern Linux systems, designed to prevent malicious code from executing during the boot process. This is achieved by verifying the authenticity of the boot loader and kernel using digital signatures. In 2025, we saw significant improvements in secure boot mechanisms, including enhanced support for UEFI firmware and better integration with Linux distributions.
[Read More]As we continue to navigate the complex landscape of containerized Linux environments in 2026, it’s essential to reflect on the lessons learned from 2025 and adapt to the evolving cybersecurity threats. In 2025, we saw a significant increase in the adoption of containerization technologies, with many organizations leveraging Docker, Kubernetes, and other container orchestration tools to streamline their application deployment and management processes.
Containerization offers numerous benefits, including improved resource utilization, increased efficiency, and enhanced scalability. However, it also introduces new cybersecurity risks that must be addressed. In 2025, we witnessed several high-profile vulnerabilities, including CVE-2022-36104, which highlighted the importance of securing containerized environments.
[Read More]The Trusted Platform Module (TPM) 2.0 has become a cornerstone in modern computing, providing a secure environment for key storage, platform authentication, and cryptographic operations. As a Senior Linux Security Architect, I’ll delve into the support for TPM 2.0 modules in various Linux distributions, exploring the technical implementation, security benefits, and potential vulnerabilities.
TPM 2.0 is a specification defined by the Trusted Computing Group (TCG), aiming to provide a standardized, vendor-agnostic interface for trusted computing. The module itself is a dedicated hardware component, typically a chip or a firmware-based implementation, responsible for managing cryptographic keys, storing platform measurements, and providing attestation services.
[Read More]The recent advancements in quantum computing have sparked a sense of urgency among cryptographers and security professionals. As quantum computers become more powerful, they pose a significant threat to our current asymmetric encryption algorithms, such as RSA and elliptic curve cryptography. To future-proof our systems, we must adopt post-quantum cryptography (PQC) solutions. In this blog post, we’ll delve into the implementation of PQC in the Linux kernel, exploring the technical details and security implications.
[Read More]Securing SSH connections is crucial for preventing unauthorized access to Linux systems. Recently, there has been an increase in attacks targeting SSH, including CVE-2022-42010, which allows attackers to bypass authentication using a malicious SSH server. To mitigate such risks, using FIDO2 and physical security keys can significantly enhance the security of SSH connections. In this blog post, we will explore how to secure SSH with FIDO2 and physical security keys on Fedora.
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