⬇ Download holy card: ·
Saint Platypus, Who Spied From the Power Readings
Patron of CPU energy meters, SGX enclaves, and everyone who thought a wattmeter could not betray a secret.
Life
On 10 November 2020 a group of European researchers presented Platypus: Intel processors' RAPL interface, meant to measure power draw, was precise enough to reveal which data the CPU was processing. From an ordinary account, with no physical tools, one could reconstruct cryptographic keys and even peek inside SGX enclaves, watching only how the energy varied. Intel and Linux restricted access to the power readings.
Prayer
O Saint Platypus, who reads secrets in the beat of the watts, let our meters not tell what we compute. Amen.
How to celebrate
Celebrated by updating microcode and kernel to limit RAPL readings to the privileged only.
Even the power draw tells what you are thinking.