 So indeed I'm going to present you a new Mac construction called JMac into a very serious joint work with Bart Menink. So if you attended track B this morning, you might have seen Casuico presenting ZMac, GMac, ZMac, whatever, which is a new Mac and the latest in a long series of very imaginatively named and good Macs such as HMac, NMac, PMac, QMac, VMac. So some designers apparently were a bit more confused about picking names for their algorithm because we also have the very famous Pelican Mac and Sandwich Mac and so empirically it seems to be the case that if you have a Mac algorithm with high probability the name will be XMac with X a letter in the Roman alphabet or Pelican or Sandwich. But the problem with this thing is that the naming space is quite small and this puts a lot of constraint on the design space as well because if you want to propose a new algorithm well you need to name it and now with more and more proposals only very few names are remaining. So it's not so obvious, well I mean this beg the question what are the names that are actually still free. So we already saw that well these are taken and well but it's not all because we can play this game and well then we have A Mac, Q Mac, O Mac, F Mac, X Mac. All of these serious algorithm presented to prestigious conferences so we get this really random-looking picture there's no hidden image in it but it goes on because we have then P Mac, M Mac, K Mac, C Mac, L Mac which update the picture of this and then we have B Mac, I Mac, T Mac, S Mac, D Mac it's not quite over we have this so now it's only a handful letters are still remaining but not for long because then we have W Mac, E Mac, G Mac and here we are we only two letters left so it seems that the only two possible Macs that can be designed until the end of crypto or J Mac and Y Mac but it's not as simple because in fact well it's well known that can use Yasuda designed and analyzed many Mac algorithms so we feel obliged to name Y Mac well to define it as P Mac plus by himself so only J now at this point in my presentation I'm really hoping that no one in the room is going to yell that they in fact designed J Mac 10 years ago but barring this with bars we're going to propose well this J Mac Mac so it takes three inputs one is the key oh sorry one input is the key K another input is the message M the third input is the letter J which is either of A B C D E F G H I K L M N O P Q or S T U V W X Y Z and then J Mac of K M J is J Mac of K M thank you