Download TrueCrypt 5.1a

Truecrypt was provided with a small update to version number 5.1a on Monday. Truecrypt is an open source encryption program for Windows 2000 and later, Linux and Mac OS X that can encrypt physical volumes (a hard drive or a partition) and virtual volumes (a file accessed as a partition). In addition, it is also possible to create a hidden volume in the encrypted disk. This second volume is only visible if the correct password is entered. So if you are forced to provide the password, you can only provide the password that gives access to the entire encrypted disk. The second hidden volume is then completely invisible. More information about this can be found at this page to be found. In version 5.1a the following changes and improvements have been made:

improvements:

• Faster booting when the system partition/drive is encrypted (typically by 10%). (Windows Vista/XP/2008/2003)
• Other minor improvements. (Windows, Mac OS X, and Linux)

Resolved incompatibilities:

• On computers with certain hardware configurations, resuming from hibernation failed when the system partition was encrypted. Note: If you encountered this problem, the content of RAM may have been saved unencrypted to the hibernation file. You can erase such data, for example, by decrypting the system partition/drive (select System > Permanently Decrypt System Partition/Drive) and then encrypting it again. (Windows Vista/XP/2008/2003)
• Remark: As Microsoft does not provide any API for handling hibernation, all non-Microsoft developers of disk encryption software are forced to modify undocumented components of Windows in order to allow users to encrypt hibernation files. Therefore, no disk encryption software (except for Microsoft’s BitLocker) can guarantee that hibernation files will always be encrypted. At anytime, Microsoft can arbitrarily modify components of Windows (using the Auto Update feature of Windows) that are not publicly documented or accessible via a public API. Any such change, or the use of an untypical or custom storage device driver, may cause any non-Microsoft disk encryption software to fail to encrypt the hibernation file. We plan to file a complaint with Microsoft (and if rejected, with the European Commission) about this issue, also due to the fact that Microsoft’s disk encryption software, BitLocker, is not disadvantaged by this.
• Workaround for a bug in the BIOS of some Apple computers that prevented users from entering pre-boot authentication passwords and controlling the TrueCrypt Boot Loader. (Windows Vista/XP/2008/2003)

bug fixes:

• When the system partition/drive is decrypted under Windows, the original partition table will not be restored. Note: This issue affected users who repartitioned an encrypted system drive and then decrypted it under Windows. (Windows Vista/XP/2008/2003)
• Other minor bug fixes. (Windows, Mac OS X, and Linux)

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