LBlock is a lightweight block cipher with Feistel-SP structure proposed by Wu and Zhang in Applied Cryptography and Network Security 2011, and a modified version LBlock-s is used later in the design of the lightweight authenticated encryption cipher LAC, one of the CAESAR candidates. The best known integral attack on LBlock is presented by Zhang and Wu which can attack 23-round LBlock based on a 16-round integral distinguisher found with division property. In Selected Areas in Cryptography 2018, Eskandari et al. further presented a 17-round integral distinguisher of LBlock with bit-based division property using SAT solver. Using their method, the authors further find some new 17-round integral distinguishers of LBlock and use one of them to present a 24-round integral attack on LBlock. Similarly, they also find some 17-round integral distinguishers of LBlock-s and select one to present a 24-round integral attack on LBlock-s. In this way, they have improved known single-key attacks on LBlock and LBlock-s by one round.

中文翻译：

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改进了对24轮LBlock和LBlock-s的整体攻击

LBlock是Wu和Zhang在Applied Cryptography and Network Security 2011中提出的具有Feistel-SP结构的轻量级分组密码，其修改版本LBlock-s稍后用于设计CAESAR候选者之一的轻量级认证加密密码LAC。 。Zhang和Wu提出了对LBlock的最著名的积分攻击，他可以根据具有分割属性的16轮积分识别器来攻击23轮LBlock。在密码学的选定区域2018中，Eskandari等。进一步介绍了使用SAT解算器的基于位划分属性的LBlock的17轮积分识别器。使用他们的方法，作者进一步找到了一些新的LBlock 17轮积分识别器，并使用其中之一对LBlock进行了24轮积分攻击。同样，他们还找到了LBlock-s的一些17轮积分识别器，并选择一个对LBlock-s进行24轮积分攻击。这样，他们将对LBlock和LBlock-s的已知单键攻击提高了一个回合。