Side channel resistance patents for post-quantum cryptography implementations

In this dataset it covers countermeasures against attacks that exploit physical implementation leakage rather than mathematical weaknesses — masking at a given masking order, differential power analysis resistance, fault injection attack countermeasures, shuffling countermeasures, randomness generation for masking, and leakage detection methods. These techniques are searched in combination with terms describing the specific countermeasure mechanism, such as performance penalty trade-offs. The scope is implementation-level hardening, applicable to both classical and post-quantum cryptographic schemes running on the same hardware.

The ranking covers 100 assignees across 369 records, with the leading assignee holding 35 records and a further concentration where the top 5 hold 108 records (29.3% of the field) and the top 10 hold 168 (45.5%). Beyond that, the field spreads across a long tail of assignees with much smaller counts each. No single company controls a majority of the claim space, though the leader has a clear structural advantage over the rest of the ranked group.

Filings peaked in 2019 at 36 records and had fallen to 19 by 2024, a 34% decline over that three-year window — a real cooling trend based on complete filing years. The 2025 and 2026 figures in any chart should be read with caution, since publication typically lags filing by roughly 18 months and those years are still filling in. The honest conclusion is that activity has cooled from its 2019 peak through the last fully-reported year, not that it has stopped.