The original JavaScript library was written by Lokesh Dhakar. But, to anyone reading this, it seems that you are fine until 143 characters, despite what the system tells you.Lightbox is a JavaScript library that displays images and videos by filling the screen, and dimming out the rest of the web page. However, the ERROR MESSAGE that I get from my NAS is that the filename needs to be less than 45 characters (whereas the reality is that it should be less than 144 characters). My tests show that files up to 143 characters (not bytes, contrary to what Synology told me) will be encrypted, but files with 144 characters will PREVENT a folder to be encrypted. It can be up to 140 pure Latin character or 45 CJK(Chinese, Japanese, and Korean) characters."įollowing this answer I did more testing myself, testing with files that were 45, 46, 140, 143 and 144 characters. I asked the exact same question directly to Synology (even pointing them to the present article), and their answer was interesting: "The encrypted share's file name limit is 143 bytes. I can live with having to rename 20 files out of 50 000 if the filenames need to be 140 characters or less, but 45 or less isn't feasible (in my situation) because it would require me to rename too many files. This thread is very interesting because I was wondering the exact same thing. It seems to me that their recommendation of 45 characters is either a typographical error (from our 140 character recommendation), or simply a far more conservative estimate. We (the upstream developers of eCryptfs) have nothing to do with Synology or their products, though we're generally happy to see eCryptfs used in the wild. Now, all that said, the Synology NAS is a commercial product that embeds and uses eCryptfs and Linux to encrypt and secure data on the device. So we (as eCryptfs upstream developers) typically recommend you limit your filenames to ~140 characters. Empirically, we have found that character filenames longer than 143 characters start requiring >255 characters to encrypt. This filename is encrypted using my key to: /home/kirkland/.Private/ECRYPTFS_FNEK_-Ĭlearly, that 7 character filename now requires more than 7 characters to be encrypted. Also, the encryption itself involves "padding" the filename.įor instance, I have an encrypted file, ~/.bashrc. eCryptfs prepends a bit of data on the front of the encrypted filename, such that it can identify encrypted filenames definitively. If filenames are encrypted, things get a little more complicated. That may (or may not) leak sensitive information depending on your use case. While an attacker would not be able to read the contents of index.html or budget.xls, they would know what file names exist. If filenames are not encrypted, then you can safely write filenames of up to 255 characters and encrypt their contents, as the filenames written to the lower filesystem will simply match. eCryptfs always encrypts file contents, but it can optionally encrypt (obscure) filenames. It stacks on top of another filesystem such as EXT4, which is actually used to write data to the disk. Linux has a maximum filename length of 255 characters for most filesystems (including EXT4), and a maximum path of 4096 characters.ĮCryptfs is a layered filesystem. Full disclosure: I am one of the authors and the current maintainer of the eCryptfs userspace utilities.
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