The fourth generation of cell phones, marketed as 4G/LTE (Long-Term Evolution) is being quickly adopted worldwide. Given the mobile and wireless nature of the involved communications, security is crucial. This paper includes both a theoretical study and a practical analysis of the SNOW 3G generator, included in such a standard for protecting confidentiality and integrity. From its implementation and performance evaluation in mobile devices, several conclusions about how to improve its efficiency are obtained.

翻译：第四代手机以4G/LTE(长期演变)市场销售,正在迅速在全世界推广,鉴于相关通信的移动和无线性质,安全至关重要,本文件既包括理论研究,也包括对SNOW 3G发电机的实用分析,并列入保护保密和完整性的标准,从移动设备的实施和性能评价中,得出了关于如何提高其效率的若干结论。