The paper introduces a new lightweight block cipher called LED, designed to be highly efficient in both hardware and software implementations. LED is optimized for use in constrained devices such as RFID tags and sensor networks. The design of LED is based on AES-like principles, featuring a simple key schedule and a compact hardware implementation. The cipher is analyzed for its resistance to various attacks, including related-key attacks, and provides provable security bounds. LED is compared with other lightweight block ciphers in terms of hardware and software performance, showing its competitive efficiency. The paper also discusses the security analysis of LED, including differential and linear cryptanalysis, cube testers, and algebraic attacks. Additionally, the paper evaluates LED in a hash function setting, demonstrating its resilience against rebound and super-sbox attacks. Overall, LED is presented as a robust and efficient solution for lightweight cryptographic applications.The paper introduces a new lightweight block cipher called LED, designed to be highly efficient in both hardware and software implementations. LED is optimized for use in constrained devices such as RFID tags and sensor networks. The design of LED is based on AES-like principles, featuring a simple key schedule and a compact hardware implementation. The cipher is analyzed for its resistance to various attacks, including related-key attacks, and provides provable security bounds. LED is compared with other lightweight block ciphers in terms of hardware and software performance, showing its competitive efficiency. The paper also discusses the security analysis of LED, including differential and linear cryptanalysis, cube testers, and algebraic attacks. Additionally, the paper evaluates LED in a hash function setting, demonstrating its resilience against rebound and super-sbox attacks. Overall, LED is presented as a robust and efficient solution for lightweight cryptographic applications.