Protect Linux from cold boot attacks with TRESOR

lotuseclat79 · Apr 6, 2012

Protect Linux from cold boot attacks with TRESOR.

Cold boot (PDF) Research Paper link ( c. 2008 ).

Abstract Contrary to popular assumption, DRAMs used in most modern computers retain their contents for seconds to minutes after power is lost, even at operating temperatures and even if removed from a motherboard. Although DRAMs become less reliable when they are not refreshed, they are not immediately erased, and their contents persist sufficiently for malicious (or forensic) acquisition of usable full-system memory images. We show that this phenomenon limits the ability of an operating system to protect cryptographic key material from an attacker with physical access. We use cold reboots to mount attacks on popular disk encryption systems — BitLocker, FileVault, dm-crypt, and TrueCrypt — using no special devices or materials. We experimentally characterize the extent and predictability of memory remanence and report that remanence times can be increased dramatically with simple techniques. We offer new algorithms for finding cryptographic keys in memory images and for correcting errors caused by bit decay. Though we discuss several strategies for partially mitigating these risks, we know of no simple remedy that would eliminate them.
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Note: TRESOR is a patch available for the Kernel 2.6.36 (32 and 64 bit) or 3.0.9 (64 bit).

Note: An example in the first link above gives instructions for installing TRESOR in Ubuntu 11.10 (64-bit) based on the following guide.

Note: The Guide done by Oliver needs translation from German to English ( http://babelfish.yahoo.com/ ) for English speakers.

-- Tom

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Protect Linux from cold boot attacks with TRESOR

lotuseclat79 Registered Member

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Protect Linux from cold boot attacks with TRESOR

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