The Fifth Area: the Silent Data Defense Line

This is not science fiction, this is the future that is happening now, and it is also the reality that you and I must face. Beyond land, sea, sky, and space, humans have opened up the "fifth domain"—the fusion of cyberspace and critical infrastructure. There is no smoke of gunpowder here, but a silent war of subjugation of the country and annihilation of the species is going on all the time. Zhang Yu (codenamed "Octopus"), a special agent of the Ministry of National Security, appears to be a technical expert at a data security company, but in fact he is lurking in the digital abyss. With the help of his self-developed "Intelligent Analysis Model for Secret Data Leakage", he captured the clues of the leakage of state secrets from the massive noise. The story begins with a "silent alarm" at the Northwest Gobi Oil Pipeline Station. The Minute Maid APT organization "Ghost Fish" uses the physical vibrations of oil pipelines to transmit Morse code and steals data through the electromagnetic leakage of submarine optical cables. This "physical layer steganography" makes traditional firewalls useless. In order to find out the truth, Zhang Yu went deep into the tiger's den. Not only did he have to face dimensionality reduction attacks by foreign hackers, but he also faced his high school best friend who became a "broiler" due to greed. This book rejects fantasy and reveals real side-channel attacks (deciphering codes by listening to sounds), supply chain poisoning (hardware Trojans), AI countermeasures samples (turning tanks into bananas) and social engineering traps. This is a war without bystanders. Zhang Yu finally understood: Real security does not rely on superheroes, but on the "people's defense line" formed by the security awareness of millions of ordinary people. "If you feel that the years are quiet and peaceful, then there must be someone carrying the burden for you in the digital abyss. But more often than not, you need to be the gatekeeper yourself."