Ivica Nikolic, Alex Biryukov. Collisions for Step-Reduced SHA-256. In Kaisa Nyberg, editor, Fast Software Encryption, 15th International Workshop, FSE 2008, Lausanne, Switzerland, February 10-13, 2008, Revised Selected Papers. Volume 5086 of Lecture Notes in Computer Science, pages 1-15, Springer, 2008. [doi]
Abstract is missing.