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A Side-Channel Assisted Attack on NTRU

June 8, 2021


Askeland Amund - University of Bergen


We take a look at the current implementation of NTRU submitted to the NIST post-quantum standardization project, and identify two strong sources of leakage in the unpacking of the secret key. The strength of the leakages is due to the target processor handling data with very different Hamming weight depending on parts of the secret key. We focus on using only these strong leakages, present a single-trace side-channel attack that reliably recovers a large portion of the secret key, and use lattice reduction techniques to find the remaining parts. Further, we show how small changes to the implementation greatly reduces the leakage without any overhead.

Event Details



Related Topics

Security and Privacy: post-quantum cryptography

Created June 07, 2021, Updated June 10, 2021