Encrypted Watermarks and Linux Laptop Security


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Date: January 2008
Type: White Paper
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Overview: The most common way to implement full-disk encryption (as opposed to encrypted file systems) in the GNU/Linux operating system is using the encrypted loop device, known as CryptoLoop. This paper demonstrates clear weaknesses in the current CBC-based implementation of CryptoLoop, perhaps the most surprising being a very simple attack which allows specially watermarked files to be identified on an encrypted hard disk without knowledge of the secret encryption key. Disk encryption is not a performance bottleneck nor does it significantly decrease the usability of the system. Therefore there are few excuses for not deploying it where ever possible.

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