Cryptographic Randomness from Air Turbulence in Disk Drives
CRYPTO '94 Proceedings of the 14th Annual International Cryptology Conference on Advances in Cryptology
Practical Cryptography
A model and architecture for pseudo-random generation with applications to /dev/random
Proceedings of the 12th ACM conference on Computer and communications security
Analysis of the Linux Random Number Generator
SP '06 Proceedings of the 2006 IEEE Symposium on Security and Privacy
New Methods for Digital Generation and Postprocessing of Random Data
IEEE Transactions on Computers
Accelerometers and randomness: perfect together
Proceedings of the fourth ACM conference on Wireless network security
Mining your Ps and Qs: detection of widespread weak keys in network devices
Security'12 Proceedings of the 21st USENIX conference on Security symposium
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Finding entropy sources is a major issue to design non-deterministic random generators for headless devices. Our goal is to evaluate a collection of sensors (e.g. thermometer, accelerometer, magnetometer) as potential sources of entropy. A challenge in the analysis of these sources is the estimation of min-entropy. We have followed the NIST recommendations to obtain pessimistic estimations from the dataset collected during our campaign of experiments. The most interesting sensors of our study are: the accelerometer, the magnetometer, the vibration sensor and the internal clock. Contrary to previous results, we observe far less entropy than it was expected before. Other sensors which measures phenomena with high inertia such as the temperature or air pressure provide very little entropy.