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let's delve into aes and talk about you know what's good about it how it works and why it was judged good enough to be the advanced encryption standard so why aes is a yes what yeah why is aes well why ryan diaz have you heard of reindoll ryan doll no no okay so in that perhaps slightly infuriating way i managed to not say anything about how it works in the last video at all let's start with a few numbers that we briefly mentioned in the last video right aes is a 128-bit symmetric block cipher that means it takes 128 bits of message and it encrypts it into 128 bits of ciphertext with some key now that key can either be 128 192 or 256 bits and that gives you just varying amounts of security right from loads to ridiculously lows right in my opinion all right so don't worry about it if you if you find your browser's using 128 bit that's okay these were specified as part of the aas standard so random had to adhere to this but just think that we're taking 16 bytes that's 128 bits and we're doing something to it that turns it into some ciphertext and because this is an sp network we're going to be doing some amount of substitution or bringing in some confusion and some amount of permutation moving things around to add diffusion.