Oct 10, 2018

[HDGEM] Got SHA-1 collision

Git stores all data in "objects." Each object is named after the SHA-1 hash of its contents, and objects refer to each other by their SHA-1 hashes. If two distinct objects have the same hash, this is known as a collision. Git can only store one half of the colliding pair, and when following a link from one object to the colliding hash name, it can't know which object the name was meant to point to.

Two objects colliding accidentally is exceedingly unlikely. If you had five million programmers each generating one commit per second, your chances of generating a single accidental collision before the Sun turns into a red giant and engulfs the Earth is about 50%.

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Posted By Blogger to HDGEM at 3/26/2017 06:10:00 PM