Abstract The cipher is a lightweight tweakable block cipher introduced at FSE 2019. Its design aims to incorporate countermeasures against Differential Fault Attacks at the algorithmic level. The cipher employs a lightweight and involutory S-box along with a simple linear layer, enabling efficient encryption and decryption operations. In particular, utilizes a straightforward tweakey schedule that generates four 64-bit round tweakeys, which are reused throughout the encryption process. Despite its lightweight design, the resistance of against impossible differential analysis has not been thoroughly evaluated, with limited attention from cryptanalysts in this regard. Hence, this paper presents a comprehensive analysis of specifically targeting its resistance to impossible differential cryptanalysis. By employing an Satisfiability Modulo Theory (SMT) based automatic search tool, we successfully identify both 12-round related-tweak impossible differential distinguishers and 15-round related-tweakey impossible differential distinguishers for , marking the first discovery of such distinguishers for this cipher. Our results indicate that the tweak in enhances the c
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