Ophcrack

Ophcrack
Ophcrack
Ophcrack-3.2.0 screenshot.png
Developer(s) Cedric Tissieres
Philippe Oechslin
Objectif Sécurité
Stable release 3.3.1 / July 29, 2009; 2 years ago (2009-07-29)
Written in C++, C
Operating system Microsoft Windows, Linux, Mac OS X
Available in English
Type Password cracking
License GNU General Public License
Website http://ophcrack.sourceforge.net

Ophcrack is a free open source (GPL licensed) program that cracks Windows passwords by using LM hashes through rainbow tables. The program includes the ability to import the hashes from a variety of formats, including dumping directly from the SAM files of Windows. On most computers, ophcrack can crack most passwords within a few minutes.[1]

Rainbow tables for LM hashes of alphanumeric passwords are provided for free by the developers. By default, ophcrack is bundled with tables that allows it to crack passwords no longer than 14 characters using only alphanumeric characters. Available for freely for download are two Windows XP tables, one small and one fast, and one Windows Vista table.[2]

Objectif Sécurité has even larger tables for purchase, intended for professional use.[3] Larger rainbow tables contain LM hashes of passwords with all printable characters, including symbols and spaces, and are available for purchase.[2]

Ophcrack is also available as Live CD distributions which automate the retrieval, decryption, and cracking of passwords from a Windows system. One Live CD distribution is available for Windows XP and lower, as well as another for Windows Vista and Windows 7.[4] The Live CD distributions of ophcrack are built with SliTaz GNU/Linux.

Starting with version 2.3, Ophcrack also cracks NTLM hashes. This is necessary if the generation of the LM hash is disabled (this is default for Windows Vista), or if the password is longer than 14 characters (in which case the LM hash is not stored).

References

  1. ^ "OPH Reviews"
  2. ^ a b "Rainbow Tables for ophcrack". http://ophcrack.sourceforge.net/tables.php. 
  3. ^ "Products". http://www.objectif-securite.ch/en/products.php. 
  4. ^ "Download ophcrack". http://ophcrack.sourceforge.net/download.php. 

External links

v · Password cracking software

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • Ophcrack — 3.2.0 …   Wikipédia en Français

  • Ophcrack — Este artículo o sección sobre informática necesita ser wikificado con un formato acorde a las convenciones de estilo. Por favor, edítalo para que las cumpla. Mientras tanto, no elimines este aviso puesto el 27 de febrero de 2009. También puedes… …   Wikipedia Español

  • Password cracking — is the process of recovering passwords from data that has been stored in or transmitted by a computer system. A common approach is to repeatedly try guesses for the password. The purpose of password cracking might be to help a user recover a… …   Wikipedia

  • Serge Vaudenay — (5 April 1968 ) is a well known French cryptographer.Serge Vaudenay entered the École Normale Supérieure in Paris as a normalien student in 1989. In 1992, he passed the agrégation in mathematics. He did his PhD at the computer science laboratory… …   Wikipedia

  • Rainbow table — A rainbow table is a lookup table offering a time memory tradeoff used in recovering the plaintext password from a password hash generated by a hash function, often a cryptographic hash function. A common application is to make attacks against… …   Wikipedia

  • Радужные таблицы — Радужная таблица (англ. rainbow table) специальный вариант таблиц поиска (lookup table), использующий механизм уменьшения времени поиска за счет увеличения занимаемой памяти или time memory tradeoff. Радужные таблицы используется для вскрытия… …   Википедия

  • Security Accounts Manager — The Security Accounts Manager (SAM) is a database stored as a registry file in Windows NT, Windows 2000, and later versions of Windows. It stores users passwords in a hashed format (in an LM hash and an NTLM hash). Since a hash function is one… …   Wikipedia

  • LM hash — Lanman redirects here. For other uses, see Lanman (disambiguation). LM hash, LanMan, or LAN Manager hash was the primary hash that Microsoft LAN Manager and Microsoft Windows versions prior to Windows NT used to store user passwords. Support for… …   Wikipedia

  • Радужная таблица — Схема упрощенной радужной таблицы с длиной цепочек равной трем. R1 R2 R3 функции редукции, H функция хеширования. Радужная таблица (англ. rainbow table)  специальный вариан …   Википедия

  • Tabla arco iris — Este artículo o sección sobre informática necesita ser wikificado con un formato acorde a las convenciones de estilo. Por favor, edítalo para que las cumpla. Mientras tanto, no elimines este aviso puesto el 17 de mayo de 2010. También puedes… …   Wikipedia Español

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”