How to hide file names with password inside zip password protected archive using zip4j

Question

I wanna zip files with password protected archive. I have such imp:

    public class ZipArchiverAdapter implements ZipArchiverPort {
    private static final Logger log = LoggerFactory.getLogger(ZipArchiverAdapter.class);

    @Override
    public void compressFilesWithPassword(List<String> fileToZipPaths, String password) throws IOException {
        String sourcePath = System.getProperty("java.io.tmpdir") + "supportPackage";
        String destPath = sourcePath + ".zip";
        System.out.println("Destination " + destPath);
        ZipFile zipFile = new ZipFile(destPath, password.toCharArray());
        for(String f: fileToZipPaths) {
            zipFile.addFile(new File(f), getParameters());
        }
    }

    private ZipParameters getParameters() {
        ZipParameters zipParameters = new ZipParameters();
        zipParameters.setCompressionMethod(CompressionMethod.DEFLATE);
        zipParameters.setCompressionLevel(CompressionLevel.ULTRA);
        zipParameters.setEncryptionMethod(EncryptionMethod.AES);
        zipParameters.setAesKeyStrength(AesKeyStrength.KEY_STRENGTH_256);
        zipParameters.setEncryptFiles(true);
        zipParameters.setIncludeRootFolder(true);

        return zipParameters;
    }
}

And this code works. Archive is zipped with password. The only problem with it is that anyone without knowing a password can open resulting zip file and see what files are inside. When You clicks on file it will require password from You. But I wanna have files inside zip hidden with password. This can be achieved using any zip program. I just don't know how to do this with zip4j. I've check docs: http://www.lingala.net/zip4j.html https://github.com/srikanth-lingala/zip4j but not find an answer.

Please help

https://stackoverflow.com/questions/15085249/how-to-encrypt-zip-file-using-zip4j — codebrane, Aug 17 '20 at 11:17

score 2 · Answer 1 · answered Aug 17 '20 at 11:38

Answer from: How to encrypt zip file using zip4j

Zip4j does not support the encryption of the file list because of patent issues.

See: http://www.lingala.net/zip4j/forum/index.php?topic=104.0

Update:

As stated in the link. The zip-specification does not include the encryption of the filelist. To hide the filenames you can create a zip-file including your files encapsulate it by zip it again. Hence if you open zip2.zip you will only see "zip1.zip" and not the original filenames.

How to hide file names with password inside zip password protected archive using zip4j

1 Answers1