#6148. Six shades lighter: a bit-serial implementation of the AES family

September 2026publication date
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Journal’s subject area:
Computer Networks and Communications;
Software;
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Abstract:
Recently, cryptographic literature has seen new block cipher designs such as PRESENT, GIFT or SKINNY that aim to be more lightweight than the current standard, i.e., AES. Even though AES family of block ciphers were designed two decades ago, they still remain as the de facto encryption standard, with AES-128 being the most widely deployed variant. In this work, we revisit the combined one-in-all implementation of the AES family, namely both encryption and decryption of each AES-128/192/256 as a single ASIC circuit. A preliminary version appeared in Africacrypt 20XX by Balli and Banik, where the authors design a byte-serial circuit with such functionality. We improve on their work by reducing the size of the compact circuit to 2268 GE through 1-bit-serial implementation, which achieves 38% reduction in area. We also report stand-alone bit-serial versions of the circuit, targeting only a subset of modes and versions, e.g., AES-192 and AES-256.
Keywords:
AES-128/192/256; Bit-serial implementation; Lightweight cryptography; Symmetric cryptography

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