On February 23rd, 2017, Google published a paper on their security blog that showed how a SHA-1 collision was possible. It proved that the aging cryptographic and hashing standard was no longer a safe or secure method. Google showed that they could produce two different files yet have them show the same hash, thus causing a collision and getting around some of the file hashing systems in place at the time. The problem is that SHA-1 hashing is still in use today by many tools.