DLDL: A Lightweight Hash Function Based on Double Linear Diffusion Layer

Due to the property of constrained resources in embedded devices, lightweight cryptography emerges in this environment. In this paper, a novel lightweight hash function DLDL is proposed, which is based on the sponge construction and PRESENT-like internal primitive. A small scale linear diffusion layer is added in PRESENT to increase the confusion of linear diffusion layer with few hardware cost. Besides, the paper analyzes the security of holistic and internal primitive and designs the multiplexing scheme of 3-bit S-box, moreover, it provides the hardware implementation of DLDL and compares with other analogous lightweight hash functions. The experimental results indicate that DLDL is close to PHOTON but a little lower than SPONGENT in terms of security. However, DLDL evidently achieves less cost than SPONGENT and PHOTON in hardware implementation.