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Category: Security

Scan Remote Host for Open Ports using nmap Port Scanner

May 12, 2016July 26, 2016 No Comments

nmap (Network Mapper) is an open source tool for network exploration and security auditing and a powerfull port scanner. It can be used locally on localhost as netstat alternative, but it’s main use case is to scan remote hosts for […]

Grzegorz Juszczak Linux, Security

Encrypt Linux Partition using LUKS cryptsetup

April 21, 2016February 23, 2018 1 Comment

LUKS (Linux Unified Key Setup) is encryption standard designed for Linux to encrypt Linux volumes or partitions. The implementation of LUKS is based on cryptsetup script as a basic disk encryption backend tool. In this tutorial we will create Linux […]

Grzegorz Juszczak Linux, Security

Detect Intrusion and Check Linux File System Integrity with AIDE

November 11, 2015May 16, 2016 No Comments

If you suspect that your system was compromised and files and/or their permissions were modified by the intruder, you can use AIDE to check your file system against some modifications. AIDE (Advanced Intrusion Detection Environment) is a file integrity checker […]

Grzegorz Juszczak Linux, Security

How to Disable or Enable SELinux on CentOS / Fedora / RHEL

October 16, 2015September 19, 2016 No Comments

SELinux (Security Enhanced Linux) is an additional method of Linux system protection. It’s a group of security contexts that determine which process can access which files, directories, ports, etc… SELinux has three modes: Enforcing: SELinux protects files, directories, ports against […]

Grzegorz Juszczak Linux, Security

Detect SSH Brute Force Attack and Locate Attacker

February 19, 2015November 13, 2015 1 Comment

Brute Force Attack consists of systematically checking all possible passwords until the correct one is found. If the host is exposed directly to the Internet (WAN) and SSH service is running on the host, it becomes a subject of constant […]

Grzegorz Juszczak Linux, Security

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