The 7z format supports strong AES-256 encryption . If the file asks for a password, its contents cannot be viewed or extracted without the correct key.
Archives are frequently used to hide malicious scripts or "zip bombs" from basic antivirus scanners. trimscroft.7z
For advanced users, running 7z l trimscroft.7z in a terminal will list all filenames inside the archive without running any potentially harmful code. The 7z format supports strong AES-256 encryption