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Kerberos V5 is an authentication system developed at MIT. Abridged from the User Guide: Under Kerberos, a client sends a request for a ticket to the Key Distribution Center (KDC). The KDC creates a ticket-granting ticket (TGT) for the client, encrypts it using the client's password as the key, and sends the encrypted TGT back to the client. The client then attempts to decrypt the TGT, using its password. If the client successfully decrypts the TGT, it keeps the decrypted TGT, which indicates proof of the client's identity. The TGT permits the client to obtain additional tickets, which give permission for specific services. Since Kerberos negotiates authenticated, and optionally encrypted, communications between two points anywhere on the internet, it provides a layer of security that is not dependent on which side of a firewall either client is on. The Kerberos V5 package is designed to be easy to use. Most of the commands are nearly identical to UNIX network programs you are already used to. Kerberos V5 is a single-sign-on system, which means that you have to type your password only once per session, and Kerberos does the authenticating and encrypting transparently. Jacques Vidrine <n@nectar.com>

Kerberos V5 is an authentication system developed at MIT. Abridged from the User Guide: Under Kerberos, a client sends a request for a ticket to the Key Distribution Center (KDC). The KDC creates a ticket-granting ticket (TGT) for the client, encrypts it using the client's password as the key, and sends the encrypted TGT back to the client. The client then attempts to decrypt the TGT, using its password. If the client successfully decrypts the TGT, it keeps the decrypted TGT, which indicates proof of the client's identity. The TGT permits the client to obtain additional tickets, which give permission for specific services. Since Kerberos negotiates authenticated, and optionally encrypted, communications between two points anywhere on the internet, it provides a layer of security that is not dependent on which side of a firewall either client is on. The Kerberos V5 package is designed to be easy to use. Most of the commands are nearly identical to UNIX network programs you are already used to. Kerberos V5 is a single-sign-on system, which means that you have to type your password only once per session, and Kerberos does the authenticating and encrypting transparently. Jacques Vidrine <n@nectar.com>

John the Ripper is a fast password cracker, currently available for many flavors of Unix (eleven are officially supported, not counting different architectures), DOS, Win32, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches (over 40 of additional hash and cipher types).

This is a Perl module for interfacing with GnuPG.

This is a PAM module for authenticating with MySQL.

Bruteblock allows system administrators to block various bruteforce attacks on UNIX services. The program analyzes system logs and adds attacker's IP address into ipfw2 table effectively blocking them. Addresses are automatically removed from the table after specified amount of time. Bruteblock uses regular expressions to parse logs, which provides flexibility allowing it to be used with almost any network service. Bruteblock is written in pure C, doesn't use any external programs and work with ipfw2 tables via raw sockets API.

OpenConnect is a client for Cisco's AnyConnect SSL VPN. Beyond Cisco's official client, OpenConnect supports multiple platforms, NetworkManager integration, and the ability to run as a user.

pdfcrack is a simple tool for recovering passwords (both owner and user ones) from pdf-documents. It should be able to handle all pdfs that uses the standard security handler but the pdf-parsing routines are a bit of a quick hack so you might stumble across some pdfs where the parser needs to be fixed to handle.

libPJL- Printer Job Language library A library and a command-line tool to use PJL- HP Printer Job Language

cryptography is a package designed to expose cryptographic recipes and primitives to Python developers. Our goal is for it to be your "cryptographic standard library". It supports Python 2.6-2.7, Python 3.2+, and PyPy. cryptography includes both high level recipes, and low level interfaces to common cryptographic algorithms such as symmetric ciphers, message digests and key derivation functions.