The post-quantum transition will not be a flag day. There is no Tuesday on which the world stops using RSA and ECDSA and starts using lattice-based signatures. For years — likely a decade or more — systems will have to do both: verify old classical signatures on existing certificates and data while issuing and checking new post-quantum ones. That dual-mode reality is an engineering problem in its own right.
US11456877B2, “Unified accelerator for classical and post-quantum digital signature schemes in computing environments,” granted to Intel Corporation on September 27, 2022, addresses it at the silicon level. Classified under H04L 9/3247 (digital signatures) with G06F 21/76, it claims one accelerator that serves both signature families.
The reason hardware acceleration matters here is that post-quantum signatures are computationally heavier than the classical schemes they replace — larger keys, larger signatures, more arithmetic. Doing them in software at scale is painful. A dedicated accelerator makes them affordable, and a unified one means a chip does not need two separate, mostly-idle blocks for the two eras.
The word “unified” is the strategically interesting part of the claim. It is not a post-quantum accelerator; it is a transition accelerator. Intel's inventor team here — Mathew, Sastry, Ghosh, Suresh, Misoczki and others — is the same cluster behind a run of Intel post-quantum hardware filings, and the recurring theme is hardware that bridges the two cryptographic worlds rather than betting everything on the new one.
Per the desk's standing rules: this is an issued grant (B2), not an application, and it describes a hardware design, not a confirmed shipping product. Intel's broader post-quantum hardware research is the obvious context.
For the portfolio reader, the signal is that the chipmakers were, by 2022, patenting the migration itself — the awkward both-at-once middle period — not just the destination. That is often where the durable, widely-licensed IP lives, because every system that migrates has to pass through it.