Announcing the first SHA1 collision

The Google security blog carriesthe news of the first deliberately constructed SHA-1 hash collision."We started by creating a PDF prefix specifically crafted to allow usto generate two documents with arbitrary distinct visual contents, but thatwould hash to the same SHA-1 digest. In building this theoretical attack inpractice we had to overcome some new challenges. We then leveraged Google'stechnical expertise and cloud infrastructure to compute the collision whichis one of the largest computations ever completed."The SHA-1 era is truly coming to an end, even if most attackers lack accessto the computing resources needed for this particular exploit.