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now what is going on guys today i want to talk about hmac so keet hashed message authentication code what it is why you need it and where it is used in the computer science and it world so if you look up this term hmac on wikipedia you will find something like it's a specific type of message authentication code involving a cryptographic hash function and a secret key yeah well that's kind of accurate but let's maybe let's maybe start a little bit easier right let's let's start with the context of this okay so let's first look at this word here hash let's quickly talk about what a hash function is so a hash function is a function right so something that maps an input to an output and what this function does is you give it an arbitrary amount of bits essentially so in the real world you give it like a string or i don't know a number or whatever but internally it's all bits right and you give it like some input it can be anything right it can be like a short string it can be like the text of a complete book it doesn't matter so like some bits or an arbitrary amount of bits and what this hash function does is it produces an output with a fixed amount of bits okay so basically this hash function is more or less something like a fingerprint so you put in some information you put in whatever you want and then it spits then it gives you like a specific amount of bits out and ideally if you have a good hash function you don't have collisions right so this entire or the whole point of fingerprinting is that if you have a different input you should also have a different output right otherwise it doesn't make sense one of the design goals of a good hash function to make sure that if you have like a different input like you have a different output makes sense right so this is like a normal hash function and there's like a lot of different hash functions like shard 256 murmur like there's there's a whole zoo of them okay and hash function hash functions in general are like very important in computer science for implementing efficient data structures and for looking up things in an efficient way okay so this is like a normal hash function yeah so now that we understand what a hash function is let's talk about h magnet so similar to a plane hash function with hmac you have an arbitrary amount of bits as an input and you also have a fixed length or a fixed amount of bits as an output but you have two more parameters so to say so for one hmac works with an arbitrary hash function so for example if you take sha 256 which is like a well-known hash function then like the...