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This paper presents the first equivalent key recovery attack on H2-MAC-MD5, which conduces to a selective forgery attack directly. H2-MAC is similar with HMAC except that the outer key is omitted. For HMAC-MD5, since the available differential paths are pseudo-collisions, all the key recovery attacks are in the related-key setting, while the authors attack on H2- MAC-MD5 gets rid of this restriction. Based on the distinguisher of HMAC-MD5 proposed by Wang et al., a pair of intermediate chaining variables, i.e., the equivalent keys (K, K'), is detected which fulfils the specific conditions on of the pseudo-collision.
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