The TrueZip project has released version 6.2.1. They write in, "This is a maintenance release. The Exception messages have been revised in various packages in order to provide more meaningful information, helping developers to understand the root cause. The methods en/decrypt in the class de.schlichtherle.io.RaesFileUtils have been fixed: The previously looked up the key using the normal path name instead of the canonical path name. Compatibility to previous releases The API has been kept fully backward compatible, so that client applications do not need to get recompiled."