If you don't expect to need to update the data, put the files to be encrypted in a folder, then in Disk Utility choose File > New > Disk Image from Folder, then select the folder to be encrypted, then select an encryption mode and set Image Format to "compressed". After creating the image, you can add, remove, and replace the files in the image and it'll expand as needed (up to the size limit you set). If it will be updated, run Disk Utility, choose File > New > Blank Disk Image, then set the volume name to something reasonable, set the size larger than you expect to need, select an encryption mode, and set the Image Format to "sparse disk image". How to create the disk image depends on whether you expect to need to update the data. How about storing the data in multiple (redundant) formats for compatibility? I think having a copy in encrypted zip format (for Windows, and probably many other OSes), and another copy in encrypted Mac disk image format for OS X? This'll be a little annoying to set up (or update), since you need to create/update two copies in sync. The two main suggestions are AxCrypt (doesn't work for me because it's Windows-only) and using a dedicated SCP account (which I don't have the ability to create).Ĭan anyone suggest a cross-platform, portable encryption method that would work for this scenario? htpasswd authentication - This may be what I fall back on if no one has a better idea, even though it's a joke in terms of actual security.Īdditionally, this post has a similar question. Put the plaintext file on a web server with. Use TrueCrypt - It would be fine if you could run TrueCrypt off of a USB key, but it looks like both the Mac and Windows versions require you to run an installer. You have to open it using the terminal, which might not even have zip installed. Use an encrypted ZIP file - Works fine on Windows, but on the Mac double-clicking an encrypted zip file gives an obscure, misleading error message. Running a self-contained program off a USB key would be okay. Additionally, the decryption might need to be done on either a Mac or a Windows computer, and she may not have the ability to install new software on it. I want to encrypt the data, but she needs to be able to decrypt it on her own, without technical support (as long as she has the password, of course). I need to give my boss backup copies of some sensitive data.
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