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80 of the Best Linux Security Applications

80 of the Best Linux Security Applications

Security is paramount. Security involves defense in depth. Approaching security one step at a time, with consistency and rigour, you can mitigate threats, and keep intruders at bay.

Intruders use a variety of different techniques in an attempt to compromise a system. For example, systems can be attacked by denial of service, cracking, intrusion, snooping (intercepting the data of another user), or viruses/worms/Trojan horses. To have a secure box, a system therefore needs a variety of defenses.

The aim of this article is to provide the user with a starting point for improving the security of a Linux machine. Basic system security (e.g. having a regular backup strategy, using hard-to-guess passwords, removing services that you don't need) is essential administration in protecting your data. But you need a more sophisticated approach to keep intruders out.

We have identified 80 of the best Linux security applications which help to protect the integrity of a system. For each application we have compiled its own portal page, providing a detailed description of the software, its features, with links to other relevant resources.

All of the software featured in this article is free to download, and almost all released under the GNU General Public License.

AMaViS Mail virus scanner
Avast! Virus protection, with anti-spyware and anti-rootkit software
AVG Free Anti-virus and Anti-spyware software
ClamAV Anti-virus toolkit for e-mail scanning on mail gateways
P3Scan Scans email messages
chkrootkit Check for signs of a rootkit
OSSEC Rootkit detection
Nixory Anti Spyware program open source for Mozilla Firefox
rkhunter Scans for rootkits, backdoors and possible local exploits
GnuPG Encrypt and sign data and communication
MailCrypt Simple interface to public key cryptography with PGP
MCrypt Developer tool for adding a wide range of encryption functions
OpenSignature Digital signature of documents
PeaZip Portable, open source archiving, encryption and file split tool
Seahorse GNOME application for managing encryption keys
Steghide Hide data in various kinds of image- and audio-files
Stunnel Encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer)
TrueCrypt Disk encryption software
Firewalls / Network Gateways
ClearOS Dedicated firewall and Internet server/gateway
FireHOL Stateful iptables packet filtering firewall configurator
Firestarter Visual firewall program
Netfilter Packet filtering framework
Linux firewall distribution
ShellTer Iptables-based firewall
Shorewall High-level tool for configuring Netfilter
Untangle Quality open source alternative to SonicWALL and WatchGuard
Turtle Firewall Firewall configuration project based on Linux 2.4.x/2.6.x and iptables
Vuumuur Powerful firewall manager built on top of iptables
Intrusion Detection
AFICK Monitor the changes on your filesystems
BASE Web front-end to query and analyze the alerts from a SNORT IDS system
Bro Passively monitors network traffic and looks for suspicious activity
Kismet Wireless network detector, sniffer, and intrusion detection system
OSSEC Open Source Host-based Intrusion Detection System
Sguil Analyst Console for Network Security Monitoring
SNARE System iNtrusion Analysis and Reporting Environment
Snort Network intrusion prevention and detection
Snort_inline Modified version of Snort
Tripwire Provides configuration audit and control features
Network Monitoring
AIM Sniff Monitoring and archiving AOL Instant Messenger and MSN messages
Argus Fixed-model Real Time Flow Monitor
Nagios Host and network monitoring tool
Nipper Network Infrastructure Configuration Parser
NSAT Network Security Analysis Tool
ntop Network traffic probe that shows the network usage
SEC Simple Event Correlator
SniffDet Remote Sniffer Detection Tool/Library
tcpdump Network debugging tool
Network Traffic Analyzer
dsniff Collection of tools for network auditing and penetration testing
Ettercap Multipurpose sniffer/interceptor/logger for switched LAN
ngrep Network grep
Kismet Wireless network detector, sniffer, and intrusion detection system
Wireshark Network protocol analyzer
Packet Crafting
Hping3 TCP/IP packet assembler/analyzer
Nemesis Packet crafting and injection utility
Scapy Interactive packet manipulation program
Yersinia Network tool to take advantage of weaknesses in network protocols
Angry IP Scanner Fast and friendly network scanner
Knocker TCP security port scanner
Unicornscan User-land Distributed TCP/IP stack
Vulnerability Scanner
Nessus Comprehensive vulnerability scanning software
SARA Third generation security analysis tool that is based on the SATAN model
Tiger Perform a security audit of UNIX systems
Log File Analyzers
AWStats Advanced web, streaming, ftp or mail server statistics, graphically
IPtables Log Analyzer Analyzes the log output from an iptables firewall
tcpreplay Use previously captured traffic in libpcap format to test network devices
tcptrace Analyze TCP dump files
The Webalizer Web server log file analysis
Data Removal
Darik's Boot and Nuke Self-contained boot floppy that securely wipes hard disks
Wipe Secure file wiping utility
Password Management
Figaro's PM GNOME application that allows password to be securely stored
KeePassX  Lightweight and easy-to-use password manager
VPN Tools
Poptop PPTP server solution
OpenVPN Full-featured SSL VPN solution
SSL Explorer Fully-featured, web-based SSL VPN server
ODESSA Open Digital Evidence Search and Seizure Architecture
Other Tools
Denyhosts SSH attack prevention
iptables Configure the Netfilter tables, chains, and rules
mtr Network diagnostic tool
Netcat Reads and writes data across network connections
Nikto Web server scanner performing tests against web servers
OpenSSH SSH connectivity tools
Smart Sign Smartcard based digital signature

Return to our complete collection of Group Tests, identifying the finest Linux software.

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Last Updated Sunday, July 26 2015 @ 03:00 PM EDT

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