Can you change the password on a disk image?

[Doc69]

Can you change the password on a disk image? In Disk Utility, 'Change Password' is grayed out if the image is mounted, and if the image is not mounted it does not show up in Disk Utility.

 

[bogdanw]

From Terminal with hdiutil chpass image
"change the passphrase for an encrypted image. The default is to change the password interac- tively.
Common options: −recover and −srcimagekey. The options −oldstdinpass and −newstdinpass allow, in the order specified, the null-terminated old and new passwords
to be read from the standard input in the same manner as with −stdinpass."

hdiutil manual https://ss64.com/osx/hdiutil.html
or open from Terminal in Preview with

man -t hdiutil | open -fa "Preview"

 

[Doc69]

From Terminal with hdiutil chpass image

Thanks, that worked! To clarify for anyone else wanting to try this, enter "hdiutil chpass " in Terminal and then drag the image file into the terminal window. Then press return.