Distinguishing Attack on the Secret-Prefix MAC Based on the 39-Step SHA-256.

Hongbo Yu Xiaoyun Wang Distinguishing Attack on the Secret-Prefix MAC Based on the 39-Step SHA-256. 185-201 2009 ACISP http://dx.doi.org/10.1007/978-3-642-02620-1_13 conf/acisp/2009 db/conf/acisp/acisp2009.html#YuW09