Fastest, tested, mostly free password recovery software with benchmarks and review
Archives → ARJ password recovery
Overview of ARJ password protection:
ARJ archiver uses a very weak encryption algorithm. This results in the fact that in case you have only one unencrypted file from the archive, then the password for this archive can be found instantly. ARJ encryption system has some other weaknesses. For example, one can find first 3 characters without using the exhaustive search, and the password testing is very fast.
File extensions: arj ARJ crypto algorithms: XOR with password ARJ encryption weakness: human factor, (very) weak algorithm Possible attacks against ARJ: brute-force / known-plaintext Attacks complexity: depends only on password length / 20
How can I recover ARJ password? If you've got unencrypted files from archive then use known-plaintext attack
Description: A command-line utility for ARJ passwords recovery, uses Password Cracking Library 2.0. Determines first three symbols of password without brute-force. A unique utility that allows finding passwords up to 12-14 characters long. The utility doesn't support stored files.
Description: Utility for recovering the lost passwords for several file types: MS-Word and MS-Excel documents; ZIP archives and ARJ archives. The program is highly optimized for speed.
Description: Advanced Archive Password Recovery recovers passwords and removes protection from ZIP and RAR archives created with all versions of PKZip, WinZip, RAR and WinRAR in their GUI and command-line incarnations. Being a flexible, customizable and highly-optimized password recovery tool, it offers best-in-class performance for recovering the most complex passwords. Guaranteed recovery is often possible for many ZIP archives in less than one hour.
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