This format supports AES-256 encryption. if you try to open it and it asks for a password, the data is encrypted. Safety Recommendations
RAR (Roshal Archive) is a proprietary format that generally offers higher compression ratios than standard ZIP files. 52869.rar
If you have a checksum (MD5/SHA-256) provided by the source, compare it to ensure the file hasn't been tampered with. This format supports AES-256 encryption