1 Introduction Block cipher is one of the most important part of symmetric cipher,which has been widely used in the field of computer communication and information system security.In order to meet the increasing demand for ensuring secure data transmission in Internet of Things(IoT)environment,lightweight block ciphers have become more and more important due to their easy software implementation,low resource consumption,ease of standardization and high security.Essentially,in order to satisfy the constraints of resource-limited devices,lightweight block ciphers strive to achieve a balance between the cost of software and hardware implementation,efficiency,and security.However,sometimes the security of lightweight block ciphers might be challenged due to the simplified structure.Thus,it is meaningful to study the type of simplified lightweight block ciphers.
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