![]() ![]() The macOS compression tool correctly stores the attribute value 3 for "Unix" here. This element of the header is host-dependent, as such the unzipper should check the element of the centrall directory file header known as "Version made by" to inspect which operating system made the file. The problem is caused by the Windows unzipper incorrectly parsing the "external file attributes" in the ZIP-header for each file/folder. You can avoid this issue by either using a different compression tool on the Mac, or by using a different decompression tool on Windows. The file contents is not really encrypted, so the files can be opened as always. However, there are no significant downsides to this as you can easily open Properties on the files and remove the checkmark on the "encrypted" attribute. This means that when unzipped the files have the encrypted attribute and their names are shown in green in the Windows Explorer. Unfortunately, one of the attributes that the macOS tools marks the files with are interpreted by the Windows built-in unzip tool as marking the file as "encrypted" (which is a special form of single-file encryption built-in to the NTFS file system). these attributes are not guaranted to be understood the same way on various operating systems). These attributes are host-system dependent (i.e. ![]() ![]() The ZIP-file contains, amongst other things, what is known as "external file attributes" for each file. When you use the "Compress" tool built-in to Finder, you'll get a ZIP-file. The reason for this is a known compatibility issue with the built-in macOS Archive program and the built-in unzipper in various Windows versions. Note- since some moderators have a tendency to delete long comment threads and lose important info, here is a link to the comment thread at the moment backed up here as of 20:13 UK time If that external drive were taken to another windows computer, then they can't be read.Īnd i'm wondering what setting on OSX is causing that? But they somehow got encrypted like that. And that user at that computer can decrypt them. As shown in the properties of the encryption in windows. I've also seen some PDFs related to adobe, from Mac users.Īnd they're encrypted as if they were encrypted on the windows machine, in that they can only be viewed from that windows username that computer. They are always encrypted."Īn example I ran into is a program I wrote in rails just a directory called "scaffoldingtest1" that I created with the command rails new scaffoldingtest1 and i'd have copied a parent directory to an external hard drive. Turns out it was from a few downloads that I can easily get. So I wanted to know what and where they were as I do not use a encryption on my computers. I was cleaning up a external hdd and came across 150 files that where encrypted. I'm not the only person that has run into this, looking for example How to list encrypted files in Windows 7? one poster writes ". I'll explain what I mean 'cos they don't look encrypted at first sight, as you can open them.īut on closer inspection, they can show up green in windows explorerĪnd the windows cipher command shows then as encrypted, and their attribute properties show as encrypted. See Protect your Mac information with encryption.Why are files from macs often encrypted when put on an external drive and that drive is plugged into a windows system? You can also encrypt a disk and protect it with a password without erasing it. You can encrypt your data without erasing it by turning on FileVault in Privacy & Security settings (see Encrypt Mac data with FileVault). If the Security Options button is not available, you can’t use Disk Utility to perform a secure erase on the storage device. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. To change the password later, select the volume in the sidebar, then choose File > Change Password. In the sidebar, select the storage device you want to encrypt.Ĭlick the Scheme pop-up menu, then choose GUID Partition Map.Ĭlick the Format pop-up menu, then choose an encrypted file system format.Įnter and verify a password, then click Choose. If Disk Utility isn’t open, click the Launchpad icon in the Dock, type Disk Utility in the Search field, then click the Disk Utility icon. In the Disk Utility app on your Mac, choose View > Show All Devices. If the device contains any files you want to save, copy them to another storage device or volume.
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