"TCTF" stands for "Tokyo Capture The Flag," an annual cybersecurity competition held in Tokyo, Japan. It is a challenging event that brings together talented hackers and security professionals from around the world to test their skills and knowledge in various areas of information security. Participants engage in intense battles of wits, solving complex puzzles, exploiting vulnerabilities, and defending their own systems. The event aims to foster collaboration, innovation, and the development of cutting-edge techniques in the field of cybersecurity.