Meet-in-the-Middle (Second) Preimage Attacks on Two Double-Branch Hash Functions RIPEMD and RIPEMD-128. - Wang, Lei; Sasaki, Yu; Komatsubara, Wataru; Sakiyama, Kazuo; Ohta, Kazuo (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)