When Encrypt file names is enabled, the archive protects its header as well as file data. A blank or generic listing can be expected behavior rather than corruption.
A normal 7z listing can reveal filenames and sizes before extraction. With encrypted filenames, those headers are protected and the archive may show only a generic password prompt. Do not infer a damaged archive from the missing list alone.
Recovery process
A normal 7z listing can reveal filenames and sizes before extraction. With encrypted filenames, those headers are protected and the archive may show only a generic password prompt. Do not infer a damaged archive from the missing list alone.
7-Zip documents AES-256 encryption for the 7z format. Record the archive extension, the archiver that created it, whether file names are hidden, and the version if available. Do not treat a ZIP tool or a renamed file as an equivalent 7z reader.
Keep the source archive unchanged and work from a copy. Extracting and recompressing creates a new container, while a partial download can look like a password failure. Use a complete file and only submit an archive you own or are authorized to process.
These details help with the first profile check.
The outlook depends on the actual encryption profile.
Common situations
Keep the source archive unchanged and work from a copy. Extracting and recompressing creates a new container, while a partial download can look like a password failure. Use a complete file and only submit an archive you own or are authorized to process.
Next step
Start with format detection and choose the appropriate path only after the file is identified.
Technical details on this page can be checked against the original format or vendor documentation.
