On Mon, Sep 23, 2013 at 01:39:35PM +0100, Michael Rogers wrote:
Apple came within a whisker of solving the problem in iOS by creating an 'effaceable storage' area within the flash storage, which bypasses block remapping and can be deleted securely. However, iOS only uses the effaceable storage for resetting the entire device (by deleting the key that encrypts the user's filesystem), not for securely deleting individual files.
Hmm well thats interesting no? With the ability to securely delete a single key you can probably use that to selectively delete files with an appropriate key management structure. eg without optimizing that, you could have a table of per file keys, encrypted with the master key. To delete a given file you'd re-encrypt everything in the file table to a new key, except the deleted file, and delete, then over-rewrite this "effaceable storage" area. Adam _______________________________________________ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
