If the password is not in your keychain, you may need to use a brute-force or dictionary attack. This involves using software to try thousands of password combinations per second.
A persistent rumor on tech forums suggests that you can use Terminal commands to skip the password verification. Commands such as hdiutil attach are often cited. how to open a dmg file on mac without password
Check the box. You will be prompted for your Mac’s user login password to reveal it. 2. Bypass Gatekeeper (For "Unknown Source" Prompts) If the password is not in your keychain,
To answer the question directly: For permission-related “password” errors, you can easily override them using Terminal commands without needing the DMG’s original password. Commands such as hdiutil attach are often cited
If a .dmg (Disk Image) file is truly encrypted, it is designed so it . The password acts as the key to scramble the data; without it, the files cannot be unscrambled.