Signal processing and communication security are important fields in modern information technology. In recent years, the two areas have mutually reinforced each other, giving rise to numerous new methods and applications. Keeping pace with the times, the 6th International Conference on Signal Processing and Communication Security (ICSPCS 2027) aims to establish a broad and effective platform for exchange and cooperation in the field, enabling participants to keep abreast of industry trends, master the latest technologies, broaden their research horizons, and promote both academic progress and the efficient application of technological achievements.