Collision attacks on SHA-2 pushed to 39 steps in new paper
jedisct1 · x · 2026-09-09
Frank Denis shares a new paper pushing collision attacks on SHA-2 to 39 steps, a notable advance over prior best results on reduced-round SHA-256. While not a practical threat to full SHA-2, this line of work steadily erodes the security margin and informs long-term hash function assessment.
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