Just-in-time post-quantum cryptography (pqc) key expansion

Abstract

The described techniques address issues associated with current post-quantum cryptography (PQC) algorithms by providing a more efficient means of key expansion. Architectures are provided for both an accelerator and an expander, which may be implemented in accordance with any suitable type of cryptographic algorithm that utilizes key expansion, such as PQC algorithms, a key encapsulation mechanism (KEM) algorithm, a Digital Signature Algorithm (DSA), etc. The accelerator architecture enables portions of the expanded key to be generated only when required by a processing block, allowing for the reuse of memory, which allows for a reduction in memory size and thus a smaller footprint (i.e. physical size) compared to conventional architectures. The expander architecture reduces the required interactions and data transfers between the processing block and the key expansion block, thereby reducing the load on the processing block and system components, such as shared buses and bridges.