Yesterday, TrueCrypt started warning users that its software is no longer secure, and urged them to migrate to Bitlocker (Windows) or FileVault (Mac) as soon as possible. According to the page, TrueCrypt decided to stop development after Microsoft finally ended support for Windows XP, since later versions of Windows offer Bitlocker as an integrated option.

Here’s the warning, displayed on TrueCrypt’s SourceForge page (truecrypt.org now redirects to its SourceForge page, as well):

The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images. Such integrated support is also available on other platforms (click here for more information). You should migrate any data encrypted by TrueCrypt to encrypted disks or virtual disk images supported on your platform.

If you are currently using TrueCrypt, you should probably switch to Bitlocker or FileVault as soon as possible. To migrate off of TrueCrypt, follow the instructions in our post on enabling encryption for client files, or check out the step-by-step tutorials on TrueCrypt’s SourceForge page.

Note that if you use Windows, you may have to upgrade your version. Bitlocker is only available on the Ultimate and Enterprise versions of Windows Vista and 7, and on the Pro and Enterprise versions of Windows 8.

(Thanks, William Chuang, for reminding me about this today!)