## Cryptology ePrint Archive: Report 2009/179

Near-Collision Attack on the Compression Function of Dynamic SHA2

Hongbo Yu and Xiaoyun Wang

Abstract: In this paper, we present a near-collision attack on the compression functions of Dynamic SHA2 for all the output sizes. For the Dynamic SHA2-224/256, the complexity is about $2^{45}$ operations and for the Dynamic SHA2-384/512, the complexity is about $2^{75}$.

Category / Keywords: secret-key cryptography /