This hash value is known as a message digest. 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. Home My Books Hash code is an Integer number (random or non-random). Scott Chacon (Author of Pro Git) - Goodreads It is no accident that "Eric", "Erik", "eric", and "Eirc" have hash values that are so different. Comparing the hash values for two inputs can give us one of two answers: the inputs are definitely not the same, or there is a possibility that they are the same. Kraken 2's index for a specific reference database with 9.1 Gbp of genomic sequences uses 10.6 GB of memory when classifying. Indeed issuer and firm identifiers are presumably unique. The file changes. Improved metagenomic analysis with Kraken 2 - PMC . That is over 700 million times the current age of the universe, with a 50% probability of *one* collision. Ideally, the only way to find a message that produces a given . You only need to ensure that the hash function is so large that intentionally finding such collisions (a collision attack) is computationally infeasible. Know your times tables, but... do you know your hash tables? Generating unique integer IDs from strings in MySQL - GreenAsh Hash Collisions in Git. SHA256 is a SHA-2 family (Secure Hash Algorithm 2) of cryptographic hash functions. Could convert to use of git rev-list --abbrev-commit --max-count=1 --format="%h" HEAD to define the short git commit SHA1 hash string and ~always (within the bounds of probability in average software development project) get a unique string length for the repository. saving…. If the hash algorithms are sufficiently distributed, then we expect a probability less than 7/10 that any single hash value has its bit on.