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We present a novel, automated way to find differential paths for MD5. Its main application is in the construction of chosen-prefix collisions. We have shown how, at an approximate expected cost of 2 39 calls to the MD5 compression function, for any two chosen message prefixes P and P , suffixes S and S can be constructed such that the concatenated values P S and P S collide under MD5. The practical attack potential of this construction of chosen-prefix collisions is of greater concern than thedoi:10.1504/ijact.2012.048084 fatcat:ykzgio3vpzd3hk5ufr7g66zmpa