How to recover ARJ passwords?
ARJ archiver uses a very weak encryption algorithm: it just XORs the password with the compressed file. That’s why 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 of password without using the exhaustive search, and the password testing is very fast, resulting in passwords up to 12-14 characters can be cracked.
