Q7 (10 pts) Trivium. Explain why warm-up phase is needed in Trivium and how Trivium achieves non-linarity. What is the first 5 bits (s1,s2,s3,s4,s5) during the warm-up phase of Trivium if the IV and the key of Trivium each consist of 80 all-one bits. Note that these are only internal bits which are not used for encryption since the warm-up phase lasts for 1152 clock cycles