UK NCSC develops SilentGlass to shield HDMI and Display Ports from Cyber Attacks

The United Kingdom’s National Cyber Security Centre (NCSC) has introduced a new hardware-based solution called SilentGlass, designed to protect HDMI and display ports from potential cyberattacks. 

As modern workplaces increasingly rely on connected devices, these seemingly simple hardware interfaces have become overlooked entry points for malicious actors. Silentglass aims to close that gap by physically blocking unauthorized or harmful connections.

The device was officially unveiled on April 22, 2026, during CYBERUK 2026, a prominent cybersecurity event that showcases cutting-edge innovations and strategies. SilentGlass is specifically engineered to function in high-risk environments, where sensitive data is frequently handled and the stakes for security breaches are particularly high. By acting as a protective barrier, it prevents unauthorized devices from interfacing with HDMI and display ports, thereby reducing the risk of data interception or system compromise.

Before its public release, Silent Glass underwent extensive beta testing and was deployed across several government agencies. These early implementations allowed developers to refine the technology and ensure its effectiveness in real-world scenarios. Following these successful trials, the device has now been made available commercially, enabling broader adoption across both public and private sectors across the globe.

One of the key motivations behind Silent-Glass is the general lack of awareness surrounding hardware interface security. While organizations often focus heavily on software defenses such as firewalls and encryption, physical ports are frequently left unprotected. 

According to Stephen Kines, co-founder of Goldilock Labs, this oversight can create serious vulnerabilities. He noted that display devices are highly susceptible because they regularly process and transmit sensitive information, making them attractive targets for attackers.

Upon identifying this security gap, the NCSC collaborated with Goldilock Labs and Sony UK to develop Silent Glass. The partnership combined expertise in cybersecurity, hardware engineering, and electronics manufacturing to create a robust solution capable of addressing advanced threats. These include espionage activities, financially motivated cyberattacks, and other sophisticated risks that are often difficult to detect and mitigate through software alone.

SilentGlass represents a shift toward more comprehensive security strategies that include both digital and physical protections. By securing hardware interfaces like HDMI and display ports, organizations can significantly reduce their exposure to unconventional attack vectors. 

As cyber threats continue to evolve, innovations like SilentGlass highlight the importance of addressing every potential vulnerability—no matter how small it may seem—to safeguard critical systems and data.