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• ophcrack

プロジェクトの歴史

The official site describes Ophcrack as a free Windows password cracker based on rainbow tables and implemented by the inventors of the method. The SourceForge project credits Philippe Oechslin and Cedric Tissieres, and the GitLab README describes the maintained code as an evolution of the original Ophcrack 1.0 developed at EPFL.

Ophcrack's early strength was attacking Windows XP-era LM hashes with precomputed tables. Later versions and table sets added NT hash support for Windows Vista and Windows 7-era systems, where LM hashes may be disabled or insufficient.

The project moved source hosting from SourceForge-era infrastructure to GitLab by the 3.7.x line, while the SourceForge site remained the main public download and table-distribution page.

採用の歴史

Ophcrack became a recognizable security-auditing package because it bundled an approachable GUI with the hard part of rainbow-table attacks: large precomputed table sets. The official table page documents free XP and Vista table families, including small demonstration-sized tables and multi-gigabyte sets with stated success rates.

Its use declined in many modern password-auditing scenarios as salted hashes, stronger Windows defaults, credential protections, and GPU-oriented crackers changed the threat model. The package remains historically important and still useful for authorized recovery or demonstrations against older Windows hash material.

使われ方

Users load Windows hashes from supported formats or recover them from a target system, then point Ophcrack at compatible rainbow tables. The tool can be run interactively through its GUI or from the command line, and LiveCD images automated the boot-and-recover workflow for older machines.

The package should be handled as a security-auditing and password-recovery tool: legitimate use requires authorization, and results depend heavily on hash type, password composition, and table coverage.

パッケージ好きにとっての重要性

Ophcrack is notable because the package is only half the story; the data tables are the real payload. Packaging it raises the old security-tool question of whether a formula should provide the engine, the tables, the LiveCD workflow, or only pointers to external artifacts.

It also captures a specific era of password cracking, when precomputed rainbow tables were a practical answer to unsalted Windows hashes before commodity GPU cracking and better credential-storage practices shifted the balance.

タイムライン

• 2003: Philippe Oechslin publishes the rainbow-table time-memory tradeoff work that underpins Ophcrack.
• 2000s: Ophcrack 1.0 emerges from EPFL-related work and becomes distributed through SourceForge.
• 2010s: XP and Vista/7 table families and LiveCD images make Ophcrack a common Windows password-recovery tool.
• 2017: The 3.7.x line reflects the source-hosting move to GitLab.
• 2018-03-06: Ophcrack 3.8.0 is published as the release listed by the official download page.

Related projects

• Ophcrack is related to rainbow tables, RainbowCrack, John the Ripper, Hashcat, Windows LM and NTLM hash formats, SliTaz-based LiveCD builds, and other password-auditing tools.

ソース

• https://gitlab.com/objectifsecurite/ophcrack
• https://gitlab.com/objectifsecurite/ophcrack/-/tree/master
• https://ophcrack.sourceforge.io/
• https://ophcrack.sourceforge.io/download.php?type=ophcrack
• https://ophcrack.sourceforge.io/tables.php
• https://sourceforge.net/p/ophcrack/wiki/Frequently%20Asked%20Questions/
• https://sourceforge.net/projects/ophcrack/