High Quality Content by WIKIPEDIA articles! Wang Xiaoyun (born 1966) is a researcher and professor in the Department of Mathematics and System Science, Shandong University, Shandong, China. At the rump session of CRYPTO 2004, she and co-authors demonstrated collision attacks against MD5, SHA-0 and other related hash functions. (A collision occurs when two distinct messages result in the same hash function output). They received a standing ovation for their work. In February 2005 it was reported that Wang and co-authors had found a method to find collisions in the SHA-1 hash function, which is used in many of today's mainstream security products. Their attack is estimated to require less than 269 operations, far fewer than the 280 operations previously thought needed to find a collision in SHA-1. Their work was published at the CRYPTO '05 conference. In August 2005, an improved attack on SHA-1, discovered by Xiaoyun Wang, Andrew Yao and Frances Yao, was announced at the CRYPTO conference rump session. The time complexity of the new attack is claimed to be 263.

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