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I made a TrueCrypt partition on a USB drive.

I can mount it fine but only using admin password, either via the graphical interface or via sudo truecrypt --auto-mount=devices. This is preventing me from using it for an automated backup. Mounting TC volumes contained in files on already mounted volumes presents no such requirement.

Is it possible to mount a Truecrypt partition volume in userspace on Mac, or otherwise without asking for password?

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If you want to access it without using a password, why do you encrypt it? I don't know the workings of TrueCrypt, but if the partition is encrypted then a password should always be required. Also is there no option to "Add password to keychain" when you type it? – Fork Sep 7 at 12:02
I'm pretty sure he means the computer's admin password, as opposed to the passphrase used to encrypt the TC container. – Shane Sep 7 at 17:10
Shane is correct -- the problem is admin password, not volume password. The volume does not have a password, it is accessed using a keyfile in my (also encrypted) home directory. – ttarchala Sep 7 at 17:35

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You could create a SUID script that has permissions to do this.
However, be warned about its insecurities in general.

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