Understanding ‘Administrator Privileges’ in Linux: A Detailed Guide to the sudo Command Mastering superpowers comes with great responsibility! Hello everyone! Today, we are going to talk about that powerful yet “dangerous” command in the Linux system—<span>sudo</span>. It acts like the “universal key” to the system; when used properly, it can yield great results, but when … Read more
1. Basic Concepts of Permissions (1) Users and Groups # View current user information $ id uid=1000(alice) gid=1000(alice) groups=1000(alice),10(wheel) # View system user file $ cat /etc/passwd root:x:0:0:root:/root:/bin/bash alice:x:1000:1000:Alice User:/home/alice:/bin/bash # View user group information $ cat /etc/group root:x:0:wheel:x:10:alice,bob developers:x:1001:alice,charlie (2) Basic Structure of File Permissions Permission bits example: -rwxr-xr– Position description: 1st bit: File … Read more
Cite this article JIN Zengwang, JIANG Lingyang, DING Junyi, et al. A Review of Research on Industrial Control System Security [J]. Netinfo Security, 2025, 25(3): 341-363. Background Introduction Industrial Control Systems (ICS) are widely used in industrial and critical infrastructure sectors, encompassing various control systems that play a crucial role in modern industrial production. Industrial … Read more
Introduction In the wave of digital transformation, microservices architecture has become the preferred model for enterprises to build resilient and scalable systems. However, when hundreds of services are scattered across a complex network, how to manage traffic uniformly, ensure security, and achieve observability becomes a key challenge in architectural design. The API gateway, as the … Read more
1. Common Backdoors Classification of Common Backdoor Types: Type Platform Characteristics Account Backdoor Linux/Windows Creates hidden users or escalates privileges Scheduled Task Backdoor Linux/Windows Uses cron / Task Scheduler to execute malicious programs Startup Item Backdoor Windows/Linux Writes to startup items for persistence Dynamic Link Library Hijacking Linux/Windows LD_PRELOAD / DLL injection Process Injection Backdoor … Read more
Concept Multi-cloud refers to the strategy of enterprises using cloud computing services from two or more cloud service providers simultaneously. These services may include Infrastructure as a Service (IaaS), Platform as a Service (PaaS), or Software as a Service (SaaS), from different public cloud providers such as AWS, Microsoft Azure, Google Cloud Platform, Alibaba Cloud, … Read more
Introduction In the world of Linux, everything is a file. From ordinary documents to system devices and process interfaces, all exist in the form of files. To ensure system security and reliability, strict permission control must be enforced on these files. Today, we will delve into understanding the Linux file system’s permission model, how permissions … Read more
IntroductionWhen we sit in a modern car and press the start button, the dashboard lights up with colorful animations, the central display mirrors the rich features of our smartphones, and the driving assistance systems silently protect our safety. Have you ever wondered what technology supports this seamless experience? The answer lies in the mysterious world … Read more
Smart Access Control Solution Based on AI MCU M55M1 Application Background Traditional smart access control systems primarily achieve security protection through technologies such as biometric recognition, alarm linkage, and real-time monitoring. They are widely used in factories, financial institutions, medical facilities, public safety areas, commercial venues, and residential areas. However, these solutions have the following … Read more
Cybersecurity Information Encryption FUTURE The Internet is a magical network that tightly weaves each of us together. It is this network that makes our lives so convenient. We can draw the knowledge we need from the Internet, truly realizing the saying, “You can know the world without leaving your home.” However, alongside the convenience brought … Read more
