2027 3rd International Seminar on Communication Technology and Data Security (CTADS 2027) will be held in Nanjing from March 12th to March 14th, 2027. The conference will focus on cutting-edge fields such as wireless communication, 5G/6G, the Internet of Things, network security, encryption technologies, and blockchain. It aims to promote innovation in communication technology and data security, build a platform for academic and industry exchange, and foster cross-disciplinary collaboration and technological advancement. We sincerely invite experts and scholars worldwide to submit original papers, share the latest research findings, and jointly discuss industry hotspots and challenges. The conference will feature keynote speeches, oral presentations, interactive sessions, and more. We look forward to your active participation. Researchers, engineers, and professionals from all sectors are warmly welcomed to submit papers and register to attend this grand event, together creating a new future for secure communication in the digital era!