![]() ? (The file may get uploaded to other places.Author of the file uploads the file and announces its SHA256 hash.This gives a quick way to check that a file hasn't been corrupted or tampered with. Instead of comparing the entire contents of both files, you can just compare their hashes. The hash lets you quickly check if two files are identical. And small changes in the original data almost always result in large changes to the SHA256 hash. It's designed to be extremely difficult to reverse to date no one has found a way to make two different files with the same, or even mostly similar hash. It's extremely unlikely that two different files have the same SHA256 hash, as there are over 10 77 (that's 1 followed by 77 zeroes) possible hashes. ![]() Here the data is shorter than the hash, but usually the file or data will be much larger. ![]() So the entire hash represents 64 x 4 = 256 bits of information, which is where the 256 in SHA256 comes from. Each character is either a digit or a letter from A to F, and represents 4 bits of information. The SHA256 hash is always exactly 64 characters long, regardless of how large the original data is. That means it's a specific formula for turning a piece of digital data like a paragraph of text or a file, into a line of characters called a hash of the data. If you just want to know how to check the SHA256 hash of the official Nxt client, skip straight to How do I find the SHA256 hash of a file?. 'This article briefly explains the motivations behind SHA256. 3.8 Oh no, my password is too weak! What should I do?.3.4 How do I make a strong, yet easy to remember, password?.3.3 How do I make a very strong password?.3.2 30 characters?!? Isn't that too much?.1.3 How do I find the SHA256 hash of a file?.1.2 Why should I care about the SHA256 hash?.
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