Gautham Sekar, Souradyuti Paul, Bart Preneel. Related-Key Attacks on the Py-Family of Ciphers and an Approach to Repair the Weaknesses. In K. Srinathan, C. Pandu Rangan, Moti Yung, editors, Progress in Cryptology - INDOCRYPT 2007, 8th International Conference on Cryptology in India, Chennai, India, December 9-13, 2007, Proceedings. Volume 4859 of Lecture Notes in Computer Science, pages 58-72, Springer, 2007. [doi]
Abstract is missing.