Somitra Kumar Sanadhya, Palash Sarkar. Deterministic Constructions of 21-Step Collisions for the SHA-2 Hash Family. In Tzong-Chen Wu, Chin-Laung Lei, Vincent Rijmen, Der-Tsai Lee, editors, Information Security, 11th International Conference, ISC 2008, Taipei, Taiwan, September 15-18, 2008. Proceedings. Volume 5222 of Lecture Notes in Computer Science, pages 244-259, Springer, 2008. [doi]