前回に引き続き https://shattered.it/ の件です。 Following Google’s vulnerability disclosure policy, we will wait 90 days before releasing code that allows anyone to create a pair of PDFs that hash to the same SHA-1 sum given two distinct images with some pre-conditions. https://security.googleblog.com/2017/02/announcing-first-sha1-collision.html Google 曰く「誰にでも、いくつかの前提条件を満たすふたつの異なる画像から、同じ SHA-1 ハッシュの PDF のペアが作