ZUC stream cipher

ZUC is a stream cipher included in the Long Term Evolution standards used in 3GPP specifications for confidentiality and integrity .^[1][2] It is named after Zu Chongzhi, the fifth-century Chinese mathematician.^[3]

It uses a 16-stage linear feedback shift register with each stage in ${\displaystyle {\rm {GF}}(2^{31}-1)}$ and produces a 32-bit word on each tick.