 Next we have the Zook design team represented by Ben Zhang telling us about the Zook 256 stream cipher and the 1-litre new stream cipher because currently there are 3 ciphers in the ETSI, SAG, 3DPP centers like the Snow 3G There is a yes and a third is the Zook and the Snow 3G and a yes are supposed to have 256 bit versions already and now we introduce the 256 bit version of Zook for the basic configuration Zook 256 take the 256 bit security and the 1-litre 8.4 bit abbey for the confidentiality for each key and abbey pair The firm consists of 20,000 to do 32 bit question and for the integrity Zook generates 32, 64, 28 bit authentication tags but now we could support up to 256 bit tags if needed and this is the structure of the cipher, the abbey problem is the linear feedback chip register defined over to do 31-1 and each cell consists of a 31 bit word and the middle layer is a bit reorganization and there is extra some contents from the ETSI and from the 32 bit words and there are 4 from the 32 bit words X1, X0, X1, X2, X3 and at the lower part is the finished machine, there are 2 memory registers and at each tab the 32 bit question word Z is generated from the cipher and the initial interface is a little bit different there is no X1 with the X3 to the output of the finished machine is that the output of the finished machine W is shifted to the right 1 bit and then you speak back to the linear feedback chip register and if we look at the cipher carefully so 256 differs from the previous question so 128 are in the initial interface and not in the message authentication type signature interface so if you are interested in cipher, please see the 42 links and for the detailed specifications we would like to invite some cryptanalysis of this cipher and we would like to give the best cryptanalysis award on this cipher at the conference this year besides, we also would like to give the award for the best software hardware implementation so 256 also at this conference so send your results to this email address what is the award? search what do people get if they have the best paper? sir what's the price? what's the present? but currently secret that's what you get for a secret key photography so the conference time is 6th of July this year in Beijing and Beijing is very good for city with very nice parks and modern buildings and we wish to see you in Beijing this summer, thank you