eCryptfs

Decrypt single file using passphrase

Asked by Felix Lechner

Can a single file be decrypted manually without going through the kernel?

In other words, can I decrypt a file ECRYPTFS_FNEK_ENCRYPTED... using just my unwrapped passphrase? I am looking for the way to do this without a mount command or even a kernel present.

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Ted_Smith (tedsmith28) said : 		#1

As far as I know, you would have to mount the dir that it lives in, just as you would if it contained many files. Though every file is encrypted with it's own unique FEK, the process of accessing a file or files is that of mounting as eCryptfs (it being a filesystem, afterall).

The a breakdown of how to do this is here (provided step-by-stpe by Dustin, though note he suspects he has found a bug)

https://answers.launchpad.net/ecryptfs/+question/104211

Ted

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