Which technique bypasses OS-level protections to retrieve encryption keys?

• A. RAM freeze trick
• B. Cold boot attack
• C. Keylogger
• D. TPM isolation

Answer: (A)

The concept hinges on data remanence in memory: encryption keys that are loaded into RAM can remain there for a short time even after power is removed, and the OS typically has no simple way to prevent an attacker from reading that memory directly once the system is powered back up. The RAM freeze trick is a practical step within this idea. By freezing the memory (or otherwise slowing its data decay), an attacker preserves more of the RAM’s contents for a longer window, increasing the chance of successfully recovering the keys from a memory dump after reboot. This technique is used to facilitate the broader cold boot attack, which exploits the persistence of RAM contents to bypass OS protections and extract encryption keys used by full-disk encryption or other cryptographic systems. In short, the RAM freeze trick helps extend the short-lived memory remnants that make a memory-based key extraction possible, aligning with the goal of bypassing OS-level protections to retrieve encryption keys.