Encryption Tools :-
| GnuPG / PGP :- Secure your files and communication with the advanced encryption. PGP is the famous encryption program by Phil Zimmerman which helps secure your data from eavesdroppers and other risks. GnuPG is a very well-regarded open source implementation of the PGP standard (the actual executable is named gpg). While GnuPG is always free, PGP costs money for some uses. |
 | OpenSSL :- The premier SSL/TLS encryption library. The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and open source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. The project is managed by a worldwide community of volunteers that use the Internet to communicate, plan, and develop the OpenSSL toolkit and its related documentation. |
 | Tor :- An anonymous Internet communication system Tor is a toolset for a wide range of organizations and people that want to improve their safety and security on the Internet. Using Tor can help you anonymize web browsing and publishing, instant messaging, irc, ssh, and other applications that use the TCP protocol. Tor also provides a platform on which software developers can build new applications with built-in anonymity, safety, and privacy features. |
 | Stunnel :- A general-purpose SSL cryptographic wrapper. The stunnel program is designed to work as an SSL encryption wrapper between remote client and local or remote server. It can be used to add SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. |
| OpenVPN :- A full-featured SSL VPN solution. OpenVPN is an open-source SSL VPN package which can accommodate a wide range of configurations, including remote access, site-to-site VPNs, WiFi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls. OpenVPN implements OSI layer 2 or 3 secure network extension using the industry standard SSL/TLS protocol, supports flexible client authentication methods based on certificates, smart cards, and/or 2-factor authentication, and allows user or group-specific access control policies using firewall rules applied to the VPN virtual interface. OpenVPN uses OpenSSL as its primary cryptographic library. |
 | TrueCrypt :- Open-Source Disk Encryption Software for Windows and Linux. TrueCrypt is an excellent open source disk encryption system. Users can encrypt entire filesystems, which are then on-the-fly encrypted/decrypted as needed without user intervention beyond entering their passphrase intially. A clever hidden volume feature allows you to hide a 2nd layer of particularly sensitive content with plausible deniability about whether it exists. Then if you are forced to give up your passphrase, you give them the first-level secret. Even with that, attackers cannot prove that a second level key even exists. |
Packet Sniffers :-
 | Ethereal :- This (also known as Wireshark) is a fantastic open source network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, delving down into just the level of packet detail you need. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It also supports hundreds of protocols and media types. Home:- http://www.wireshark.org Latest Release:- Wireshark 1.0.4 (Ethereal) Download:- http://www.wireshark.org/download.html |
 | Kismet :- A powerful wireless sniffer. Kismet is a console based 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. It identifies networks by passively sniffing, and can even decloak hidden networks if they are in use. It can automatically detect network IP blocks by sniffing TCP, UDP, ARP, and DHCP packets, log traffic in Wireshark/TCPDump compatible format, and even plot detected networks and estimated ranges on downloaded maps. Home:- http://www.kismetwireless.net Latest Release:- Kismet-2008-05-R1 Download:- http://www.kismetwireless.net/download.shtml |
 | Tcpdump :- The classic sniffer for network monitoring and data acquisition. It is great for tracking down network problems or monitoring activity. There is a separate Windows port named WinDump. TCPDump is the source of the Libpcap/WinPcap packet capture library. Home:- http://www.tcpdump.org Latest Release:- TCPDUMP 4.0.0 Download:- http://www.tcpdump.org/ |
 | Ettercap :- Ettercap is a terminal-based network sniffer/interceptor/logger for ethernet LANs. It supports active and passive dissection of many protocols (even ciphered ones, like ssh and https). Data injection in an established connection and filtering on the fly is also possible, keeping the connection synchronized. Many sniffing modes were implemented to give you a powerful and complete sniffing suite. Plugins are supported. It has the ability to check whether you are in a switched LAN or not, and to use OS fingerprints (active or passive) to let you know the geometry of the LAN. Home:- http://ettercap.sourceforge.net Latest Release:- Ettercap NG-0.7.3 Download:- http://sourceforge.net/projects/ettercap/ |
 | DSniff :- A suite of powerful network auditing and penetration-testing tools. This popular and well-engineered suite by Dug Song includes many tools. dsniff, filesnarf, mailsnarf, msgsnarf, urlsnarf, and webspy passively monitor a network for interesting data (passwords, e-mail, files, etc.). arpspoof, dnsspoof, and macof facilitate the interception of network traffic normally unavailable to an attacker (e.g, due to layer-2 switching). sshmitm and webmitm implement active monkey-in-the-middle attacks against redirected ssh and https sessions by exploiting weak bindings in ad-hoc PKI. Overall, this is a great toolset. It handles pretty much all of your password sniffing needs. Home:- http://www.monkey.org Latest Release:- dsniff-2.3 Download:- http://www.monkey.org/~dugsong/dsniff/ |