Two objects colliding accidentally is exceedingly unlikely. A description of Google's SHA-1 colliding PDFs can be found here. What's new in Git 2.11? | HackerNoon Then the advantage of EXP1 A,REUAS HASH becomes Adv1 A,REUAS HASH (t 1, q R) = max⁡ A {S u cc1 A,REUAS HASH}, where the maximum is taken over all A's with the execution time t 1 and the number of queries q R made to the Reveal . GnuPG Short ID Collision Has Occurred. - Slashdot However, Git makes no guarantee that a subset of the hash value is unique; and in the case of a collision, it will ask you to provide enough digits to yield . The number of randomly hashed objects needed to ensure a 50% probability of a single collision is about 2 80 (the formula for determining collision probability is p = (n(n-1)/2) * (1/2^160)). 'First ever' SHA-1 hash collision calculated. All it took were five ... So, to answer your question: yes, there are known collisions for SHA-1 at the time of writing this (February 2017). See here for example, how you can do it. You've probably noticed that Git object […] [PATCH] scripts/setlocalversion: make git describe output more reliable It's . Bobo the amoeba has a 25%, 25%, and 50% chance of producing 0, 1, or 2 offspring, respectively. Powered By GitBook. Revision Selection · git - Gitbooks It's not hard to come up with a hash collision for tuples: >>> hash( (1,0,0) ) 2528505496374819208 >>> hash( (1,-2,-2) ) 2528505496374819208 The underlying reason is that the hashing code mixes ^ and *. 2^80 is 1.2 x 10^24 or 1 million billion billion. The SHA256 Collision That Wasn't - Medium If we weren't worried about sha1 collisions in git then we wouldn't switch to a new hash function. if a file changes, its hash will also change (with high probability). Pro Git. 10. Improved metagenomic analysis with Kraken 2 - PMC 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 One other thing to note is the Git . Chance of short SHA1 hash collision at 7 character hash string #2 - GitHub

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