A description of Google's SHA-1 colliding PDFs can be found here. When you take all these into consideration, hopefully you will begin to see how various actions might impact how the commit hash is formed. If the input is longer than the output, then some inputs must map to the same output — a hash collision. The SHA256 Collision That Wasn't - Medium It *might* be possible to adapt the collision attack for git, in the sense that it might be possible to construct a pair of files x,y such . The practical full collision linked above shows why you should not be using SHA-1 anymore. SHA-1 collision detection on GitHub.com - The GitHub Blog I don't have a source for this, but I've heard (in the context of git) that the probability of two different files having the same sha1sum is about the same as the probability of every . You only need to ensure that the hash function is so large that intentionally finding such collisions (a collision attack) is computationally infeasible. If all 6.5 billion humans on Earth were programming, and every second, each one was producing code that was the equivalent of the entire Linux kernel history (3.6 million Git objects) and pushing . The Linux kernel has just passed 5 million objects in it's Git repository, and defaults to twelve hexdigits under Git 2.11: linux.git. This meant that we've odds of 5000:1 (so in about the probability 0.0002 to catch a collision on such a dataset). In this section we will study the short integer solution problem and a hashing algorithm that is based on this algorithm. code that was the equivalent of the entire Linux kernel history (3.6 million Git objects) and pushing it into one enormous Git repository, it would take roughly 2 years until that repository contained enough objects to have a 50% probability of a single SHA-1 object collision." - Scott Chacon The problem with SHA-1 is the collision attack that way before the actual attack shattered.io NIST dropped it in 2011 from digital signatures since finding collision has catastrophic result in Digital Signatures. 2) Even if git did rely on SHA-1, there's no imminent threat. Supercharging the Git Commit Graph IV: Bloom Filters - Azure DevOps Blog . The program I wrote was short, simple, and it worked. MurmurHash3 collision property · Issue #58 · aappleby/smhasher - GitHub
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