Examining the Birthday Paradox

By Antoon Bosselaers, Hans Dobbertin, Bart Preneel

Dr. Dobb's Journal January 1997

Figure 1: Outline of the compression function of RIPEMD-160. Inputs are a 16-word message block X_i[0..15] and a 5-word internal state h₀h₁h₂h₃h₄, output is a new value of the internal state. and permute the order of the words within the message block X_i[0..15], that is, they permute the indices 0..15; ² means that is applied twice. The f_j's are 5 nonlinear functions and the _j's and '_j's are 10 additive constants.

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