Correct. He's talking about the automated method used on shattered.io to detect files which use the attack. See: https://github.com/cr-marcstevens/sha1collision

Correct. He's talking about the automated method used on shattered.io to detect files which use the attack. See: https://github.com/cr-marcstevens/sha1collisiondetection https://github.com/cr-marcstevens/sha1collisiondetection They're basically building that into git so that if this specific collision attack is ever used, git will notice and throw a warning/error.