Scott Chacon (Author of Pro Git) - Goodreads MD5. By default 7-14 url-friendly characters: A-Z, a-z, 0-9, _-. MurmurHash3 collision property · Issue #58 · aappleby/smhasher - GitHub The SHA-1 digest is 20 bytes or 160 bits. So, the probability of getting a collision decreases . The First Collision for Full SHA-1 - SpringerLink To demonstrate a simple collision take the following two function outputs below: int cat_idx = hashCode("cat") % table_size; // cat_idx is now equal to 1. int dog_idx = hashCode("dog") % table_size; // dog_idx is now also equal 1. . This is used to detect changes in such applications as git L7 (and others, I am sure). > >> We will use the hash code generated by JVM in our hash function and compress the hash code we modulo (%) the hash code by the size of the hash table. That's 1,200 times the number of grains of sand on the earth. SHA-1 - Wikipedia OJFord on Nov 30, 2016 . The probability of finding any collisions is still less than 10^-9 after 500 trillion (5*10^14) years. Git - git-rev-parse Documentation But if you could find a hash function that almost never had collisions, then you could, with very high probability, be sure that if the hashes are the same, the files they represent are also the same. Given this, you would only have to be struck and killed by lightning 6.8 years in a row to equal a sha1 hash collision probability. PDF An Analysis of Compare-by-hash - GNUnet Git Repositories In fact, it is common to refer to commits by just a 7-character hash (like the af64eba reported by git commit earlier) because even this collision probability is negligible for a small repository.
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