Mounting Encrypted Home Directories

Unwrap the old passphrase to get the mount passphrase:

   ecryptfs-unwrap-passphrase /old/.ecryptfs/user/wrapped-passphrase

Generate the kernel session keys:

   ecryptfs-add-passphrase --fnek

The value in brackets on the second line is the one to remember. Now mount the .Private directory:

   mount -t ecryptfs /old/.ecryptfs/user/.Private /mnt/old

As passphrase enter the mount passphrase from above. Choose aes, 16, answer no to plaintext passthrough, yes to filename encryption and enter the value I told you to remember earlier.

Done.