For years, TrueCrypt has been the gold standard open source whole disk encryption solution. Now there is a disturbing announcement on the TrueCrypt website. Right at the top it says "WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues”.
The rest of the page has been changed to a notice that development on TrueCrypt stopped this May, and directions for migrating from TrueCrypt to BitLocker, the disk encryption tool built in to Windows. Of course, this is of little help to anyone using TrueCrypt on Mac or Linux. It is still possible to download TrueCrypt from the site, but the code now will not create new vaults, and warns users to migrate to a new platform.
There are certainly alternatives, but this is a real shock. On Mac, one could always use the built in FileVault tool. Linux users may have a harder time finding a good replacement.
The big question is, what the heck is actually going on here. This is all far too cryptic, with no where near enough actual information to draw intelligent conclusions.
A recent independent audit of TrueCrypt discovered “no evidence of backdoors or otherwise intentionally malicious code in the assessed areas.”
There are a number of theories about what is going on ranging from credulous to paranoid.
- Like Lavabit, they received a National Security Letter requiring compromise of the code. This is their way of resisting without violating the gag order.
- They have been taken over by the government, and they are trying to force everyone to move to a less secure / more compromised solution.
- There really is a gigantic hole in the code. Releasing a fix would tell attackers the exact nature of the vulnerability, which most people would take a very long time to address. Having everyone migrate is the safest solution.
- Some personal conflict within the TrueCrypt developers is leading to a “take my ball and go home” action.
- The developers only cared about protecting windows users with XP or earlier, which did not have the built in disk encryption. Now that XP support has ended, they don’t feel it is valuable any more. This is suggested by the full wording of the announcement.
- The website or one of the developer’s computers was compromised, and this is a hack / hoax.
The whole thing is really odd, and it is not yet obvious what the best course of action might be.
The safest option appears to be to remove TrueCrypt, and replace it with some other solution, either one that is built in to the OS, or from a third party.