ARJ archiver
Very simple and weak encryption algorithm is used in this
archiver. “Exclusive OR” logical
operation is performed on the archive contents. The second argument in this operation is a password. Of
course, we can use a known-plaintext attack, or just brute-force approach if archive
contents is unknown. But in the latest versions of ARJ strong encryption (GOST
algorithm) is available as an option.
Applications for password recovery: