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Is it possible to encrypt a single directory (or a group of directories) of a Mac? Is it possible with third-party software?

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possible duplicate of Mac OS X full-disk encryption, with Time Machine – Sathya Aug 20 '10 at 3:57
I changed the question because I am really interested on encrypting a single directory, rather than creating a new partition, and encrypting it. – kiamlaluno Aug 20 '10 at 14:13
up vote 1 down vote accepted

The two solutions below may be of use for you.

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Knox is a just a nice front-end to creating and managing encrypted Disk Images as is already easily possible with Disk Utility. I've used it for a while until a bug in its password handling code caused me to lose one of the containers. – Daniel Beck Aug 9 '12 at 5:41

another third party solution is truecrypt. I use it with OS X, Ubuntu and Windows.

TrueCrypt is open source.

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It looks like you have edited your question so that it now refers to encrypted directories, not volumes. While you cannot encrypt directories directly, as far as I know, you can use encrypted disk images to protect files on your hard drive without encrypting the entire drive.

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I apologize for the change. I was taking the assumption it was not possible to encrypt single directories; when I saw the reply about File Vault, I remembered what I was first trying to do, and I changed the question. – kiamlaluno Aug 20 '10 at 14:18

For a third party solution I would recommend PGP whole disk encryption

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