If these are all equally probable (the best case), then it would take 'only' approximately 5 billion attempts (5.38 × 109) to generate a collision using brute force.
若这些输出均可能发生（理想情况下），则攻击者“仅仅”需要约50亿次尝试（5.38 × 109）就能通过暴力攻击生成碰撞。