[Resource Topic] 2022/230: Apple vs. EMA: Electromagnetic Side Channel Attacks on Apple CoreCrypto

Welcome to the resource topic for 2022/230

Apple vs. EMA: Electromagnetic Side Channel Attacks on Apple CoreCrypto

Authors: Gregor Haas, Aydin Aysu


Cryptographic instruction set extensions are commonly used for ciphers which would otherwise face unacceptable side channel risks. A prominent example of such an extension is the ARMv8 Cryptographic Extension, or ARM CE for short, which defines dedicated instructions to securely accelerate AES. However, while these extensions may be resistant to traditional “digital” side channel attacks, they may still vulnerable to physical side channel attacks. In this work, we demonstrate the first such attack on a standard ARM CE AES implementation. We specifically focus on the implementation used by Apple’s CoreCrypto library which we run on the Apple A10 Fusion SoC. To that end, we implement an optimized side channel acquisition infrastructure involving both custom iPhone software and accelerated analysis code. We find that an adversary which can observe 5-30 million known-ciphertext traces can reliably extract secret AES keys using electromagnetic (EM) radiation as a side channel. This corresponds to an encryption operation on less than half of a gigabyte of data, which could be acquired in less than 2 seconds on the iPhone 7 we examined. Our attack thus highlights the need for side channel defenses for real devices and production, industry-standard encryption software.

ePrint: https://eprint.iacr.org/2022/230

See all topics related to this paper.

Feel free to post resources that are related to this paper below.

Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.

For more information, see the rules for Resource Topics .