When an online system stores your credentials, it usually stores both your username and password in a database. Notice that it’s the same as the hash value we created earlier! In the words of Bernadette Peters in THE JERK, “This s_t really works!” Hashing and Passwords Hash = hashlib.md5(“Dataspace”.encode(‘utf-8’)) HASHTAB REVIEW CODEHere’s a quick example coded in Python (call me if you’d like to walk through this code – I’d love to chat!): Hashing capability is available in standard libraries in common programming languages. For example, MD5, SHA1, SHA224, SHA256, Snefru… Over time these formulae have become more complex and produce longer hashes which are harder to hack. There are a huge number of widely accepted hashing algorithms available for general use. HASHTAB REVIEW HOW TORemember, hashing is different – you can’t get your original data back simply by running a formula on your hash (a bit about how to hack these, though, in a moment). With encrypting you pass some data through an encryption formula and get a result that looks something like a hash, but with the biggest difference being that you can take the encrypted result, run it through a decryption formula and get your original data back. If you need to go in two directions, you need encrypting, rather than hashing. Hashing works in one direction only – for a given piece of data, you’ll always get the same hash BUT you can’t turn a hash back into its original data. For example, the MD5 for dataspace with a small d yields 8e8ff9250223973ebcd4d74cd7df26a7 Hashing is One-Way Ĭhanging even one character will produce an entirely different result. Every time it will return that same value. So, for example, the MD5 formula for the string Dataspace returns the value e2d48e7bc4413d04a4dcb1fe32c877f6. Regardless of whether you feed in the entire text of MOBY DICK or just the letter C, you’ll always get 32 characters back.įinally (and this is important) each time you run that data through the formula, you get the exact same hash out of it. For example, the MD5 formula always produces 32 character-long hashes. That hash is usually a string of characters and the hashes generated by a formula are always the same length, regardless of how much data you feed into it. Hashing is simply passing some data through a formula that produces a result, called a hash. Hashing What does it mean to hash data and do I really care? What is Hashing?
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