The briefing was not announced publicly. No press release went out, no official schedule was published. But at the 2025 Taipei Aerospace and Defense Technology Exhibition, Vice President Hsiao Bi-khim (蕭美琴) made her way to a booth tucked among the larger, more prominent displays and stood for an extended period, listening.
The company presenting to her was not a household name. It had no splashy product videos, no scale models of fighter jets, no marketing apparatus designed to attract attention. What it had was a conference table's worth of electronic modules — compact, austere, labeled with alphanumeric identifiers that meant nothing to a casual observer — and a team of engineers who could explain, in precise technical language, exactly what each one did inside Taiwan's weapons systems.
Also present that day: Lieutenant General Lien Chih-wei (連志威), deputy chief of the Ministry of National Defense's Operations and Planning Office. The Operations and Planning Office is the military body responsible for joint defense planning, force posture development, and the design of major exercises. Its deputy chief does not typically attend trade exhibition booths. His presence, like the Vice President's, was a signal — quiet, deniable, and unmistakable to anyone paying attention.
The company was Zyxel Group (合勤科技). And the fact that Taiwan's second-highest elected official and one of its most senior operational military planners both found time to stand at its exhibition booth says something important about what happens inside its Hsinchu headquarters that the world, until now, has not been told.
How Does a Router Company End Up Building Taiwan's Missile Electronics?
The answer starts not in a science park but in a broken apartment.
Chu Shun-yi (朱順一), now the company's chairman, describes those early days with the particular fondness that founders reserve for hardships they survived. The office was so small and so poorly appointed that calling it an office felt generous. "It was more like a broken apartment," he said, and laughed. But his tone, even in recollection, carries the weight of the circumstances that made it necessary.
When the United States terminated diplomatic relations with the Republic of China in 1979, Taiwan lost its most important security guarantor overnight — at least in formal terms. What followed was a period of forced self-reliance that shaped the country's defense industrial base for generations. Aircraft, missiles, communications systems: if Taiwan needed them and could not reliably obtain them from abroad, Taiwan would have to build them itself. The engineers who answered that call worked at the National Chung-Shan Institute of Science and Technology — CSIST — a government defense research body that became the seedbed for Taiwan's indigenous weapons programs.
They produced, across the following decade, the three-missile-one-aircraft triad that defined Taiwan's deterrent posture: the Sky Bow (天弓) surface-to-air missile, the Sky Sword (天劍) air-to-air missile, the Hsiung Feng (雄風) anti-ship missile, and the Indigenous Defense Fighter. It was engineering achieved under pressure, with limited resources, against a backdrop of genuine strategic urgency. The people who did it were exceptional.
Then the political calculus shifted. When President Lee Teng-hui moved Taiwan's defense procurement policy toward foreign purchases in the 1990s — F-16s from the United States, Mirage 2000s from France — the rationale for maintaining a large domestic research establishment weakened. CSIST contracted. Engineers who had spent careers developing some of the most sensitive military technology in the Western Pacific found themselves without institutional homes.
Chu hired them.
Why Did Taiwan's Best Defense Engineers End Up at a Networking Company?
Chu traces it to a gap that nobody else had thought to fill.
"When I started the company in Hsinchu, TSMC and Winbond had all come out of ITRI's electronics division," Chu recalled. "But ITRI had no communications division. The only organization in Taiwan doing communications at that level was CSIST. So when I needed engineers, that's where they came from."
The fit was not immediately obvious. Zyxel's commercial business was telecommunications equipment — routers, switches, network infrastructure. CSIST engineers had spent their careers on classified military programs. Deploying that talent on commercial networking products felt, to Chu, like a category error.
"These were specialists," he said. "Using them just for commercial telecom work was a waste of what the country had invested in training them. So we changed direction."
The decision to redirect toward military communications technology was, in retrospect, the pivot that defined the company's next three decades. Military communications demands capabilities that commercial applications never require: resistance to jamming, resistance to interception, the ability to maintain function in electromagnetically hostile environments where adversaries are actively trying to degrade your ability to communicate. Developing those capabilities required exactly the kind of deep, patient engineering work that CSIST alumni were trained to do.
Li Bing-qin (李炳欽) is the clearest example of what that talent migration produced. Before joining Zyxel's defense subsidiary Zyflex Technology (智勤科技) — where he now serves as general manager — Li led CSIST's missile seeker development team. He spent years working on the guidance electronics for Taiwan's domestically produced missiles. When he moved to Zyxel, he brought that institutional knowledge with him, and applied it to building the company's military capability from within.
The seeker processors that now guide Taiwan's Hsiung Feng and Sky Sword missiles are, in a meaningful sense, the work of a CSIST engineer who left the institute but never really left the mission.
If Zyxel Is So Critical to Taiwan's Defense, Why Has Almost Nobody Heard of It?
Zyxel has been a defense contractor for more than two decades. In that time, it has become the dominant domestic supplier of electronic warfare systems to all three branches of Taiwan's armed forces and the coast guard. Its products appear in missile seekers, naval radar, army communications networks, fighter aircraft data links, counter-drone systems, and electronic warfare simulation platforms. By any reasonable measure, it is one of the most important companies in Taiwan's defense industrial base.
Almost nobody knows it exists.
"The outside world doesn't know," Chu said. "But Beijing knows."
The matter-of-factness with which he says this is striking. There is no drama in his delivery, no suggestion that the knowledge makes him proud or frightened. It is simply a fact of operating in this business, in this place, at this moment in history. China's intelligence services are aware of what Zyxel makes. They are aware of its role in Taiwan's missile programs. They have designated it, according to Chu, as a priority target.
The implications of that designation are not abstract. Chinese state-sponsored cyber operations against Taiwan's defense industrial base are persistent, sophisticated, and — in some cases — successful. Zyxel has been a target for long enough to have developed a response that has itself become a business.
When China's Hackers Come for Your Missile Secrets, What Do You Do?
For Zyxel, the answer evolved from a liability into a business.
"Before, PLA hacker units would attack us directly," Chu said. "Now they work through front companies — civilian firms used as intermediaries so the attacks are harder to attribute."
The escalation in sophistication required a corresponding escalation in defense. Zyxel tried commercial cybersecurity providers. The results were inadequate — not because the providers were incompetent, but because the threat profile Zyxel faces is specialized in ways that general-purpose security services are not designed to handle. Protecting a company that manufactures classified missile components against a state-sponsored adversary with specific knowledge of what you make and specific motivation to steal it is a different problem from protecting a bank against financial crime.
Zyxel's IT department built its own defense system. It worked well enough that other organizations began asking for help. That demand eventually led to the creation of a dedicated subsidiary — Black Cat Information (黑貓資訊) — which now provides cybersecurity services to both private companies and government agencies, including government ministries whose networks face the same adversary.
"Defense and cybersecurity are deeply connected now," Chu said. "You can't separate them."
The observation carries more weight than it might seem. Taiwan's military capability depends not only on the hardware that companies like Zyxel produce, but on the integrity of the information systems that protect the designs, manufacturing processes, and operational parameters of that hardware. A missile whose guidance algorithms have been compromised before it ever leaves the factory is not a missile at all. The digital defense of Taiwan's defense industrial base is, in this sense, as important as any physical weapon system.
What Does It Actually Cost to Spend Your Career Building Taiwan's Weapons in Secret?
The weapons industry has a saying: ten years without an order, then ten years of eating well. Chu Shun-yi has a less romantic answer.
"Taiwan's defense situation is genuinely difficult," he said. "Sometimes you want to buy something and you can't get export approval from the supplier. Sometimes you develop something domestically and run into obstacles that have nothing to do with the technology — political factors, procurement politics, institutional resistance."
The financial reality compounds the strategic one. A defense contract that takes more than a decade to develop and qualify is not a path to quick returns. The revenues generated by military programs, even successful ones, are modest compared to what Taiwan's semiconductor or AI industries produce on a quarterly basis. Companies operating in the commercial technology sector in the same science park generate orders of magnitude more revenue from products that took a fraction of the time to bring to market.
"Compared to an electronics contract manufacturer, or compared to what's happening in AI right now, defense revenues are small," Chu acknowledged. "A few hundred million is considered good. But these engineers — we trained them, they have this knowledge, they're doing work that matters. If we redirect them to commercial work just for the revenue, that feels wrong. So we stay."
The engineers themselves have made a version of the same calculation, though in more personal terms. The controlled-personnel designation — the travel restrictions, the disclosure obligations, the security clearances — represents a genuine constraint on professional and personal freedom. It is not a symbolic gesture. It is a legal status that follows these individuals for the duration of their careers and, in some respects, beyond.
For junior employees encountering it for the first time, the adjustment can be difficult. A family trip to the mainland that requires advance government notification, or cannot happen at all. A conversation at a dinner party that has to stop before it begins. The restrictions feel abstract until the moment they become concrete.
"Senior staff take a different view," Chu said. "They've carried this for years. They see it as part of what they signed up for — an obligation to the company and to the country. It's not a burden to them anymore. It's just who they are."
Why Would Taiwan's Vice President and a Three-Star General Both Visit an Unknown Defense Booth?
Because what was on that table is not supposed to be talked about — and the people who matter most in Taiwan's defense establishment know exactly what it means.
Hsiao Bi-khim's visit was not a ceremonial appearance. Vice presidents do not typically attend defense exhibitions to be photographed next to equipment they cannot evaluate. Her presence at Zyxel's booth — listening to a technical briefing, asking questions, spending time with engineers who could answer them — reflected a deliberate decision to engage with the specifics of what this company makes and why it matters.
Lieutenant General Lien's presence carried a different kind of signal. The Operations and Planning Office is where Taiwan's joint defense concepts are developed and tested. A deputy chief who visits an exhibition booth is, in effect, conducting an informal operational review — assessing whether the capabilities on display align with the requirements his office is trying to meet. That he found it worth his time to stand at Zyxel's table is its own form of institutional endorsement.
Together, the two visits constitute something close to a public acknowledgment — deliberately low-key, unlikely to generate headlines in Chinese state media, but legible to anyone in Taiwan's defense establishment — that Zyxel's role in the country's military capability is considered important at the highest levels.
The company, for its part, remains characteristically quiet about it. Chu mentions the visits the way he mentions most things: directly, without embellishment, as facts that speak for themselves.
So What Does Taiwan's Defense Actually Rest On — If Not the Weapons Everyone Can Name?
On the things nobody talks about. On the companies nobody has heard of. On engineers who have agreed, in writing, to stay silent for the rest of their careers.
There is a version of Taiwan's defense story that international audiences know reasonably well: the F-16 upgrades, the Harpoon missile purchases, the debates in Washington about arms sales and security guarantees. It is a story told largely in terms of big platforms, big numbers, and big geopolitical stakes.
Zyxel's story is a different kind of defense story — smaller in scale, harder to see, and in some ways more revealing about how deterrence actually works. The signal processor inside a missile seeker is not a headline. The cybersecurity subsidiary protecting classified manufacturing data is not a talking point. The engineer who has agreed, in writing, never to discuss his work — who cannot take certain trips, cannot have certain conversations, who carries his security obligations the way other people carry their professional identities — is not a figure who appears in strategic assessments.
But without those processors, those networks, and those engineers, the missiles don't hit their targets. The communications systems go dark under jamming. The defense industrial base bleeds its most sensitive knowledge to adversaries who have been trying to extract it for years.
Zyxel's production lines keep running. In a basement in Hsinchu, vibration machines shake components to tolerances that exceed anything the commercial world requires. In temperature chambers on the ground floor, electronics cycle through thermal stresses that simulate the physics of a missile in flight. On the mysterious floor above, workers follow procedures they are not fully briefed on, assembling systems whose ultimate purpose they are not told.
The company next door to TSMC carries, quietly and without fanfare, a portion of the weight on which Taiwan's security depends. It has done so for more than twenty years. It intends, Chu made clear, to keep doing so.
"We stay in this," he said, near the end of our conversation, as if settling a question that had never seriously been in doubt. "That's all there is to it."
