Google has announced the public rollout of Device Bound Session Credentials (DBSC) in Chrome 146 for Windows, introducing a new security standard designed to combat the growing threat of cookie theft. The feature, with macOS support expected in a future release, aims to protect user sessions by binding them cryptographically to individual devices, preventing attackers from reusing stolen authentication cookies.
Cookie theft has become a widely exploited attack method, where infostealer malware infiltrates devices, extracts stored browser cookies, and sends them to attacker-controlled servers. Since these cookies often remain valid for extended periods, cybercriminals can bypass passwords and gain unauthorized access to user accounts, later selling the stolen credentials on underground markets.
DBSC directly addresses this vulnerability by ensuring that authentication sessions are tied to hardware-backed security modules on a user’s device. On Windows systems, this is enabled through the Trusted Platform Module (TPM), while macOS devices will leverage the Secure Enclave. These modules generate unique cryptographic key pairs that cannot be exported, ensuring that session credentials remain locked to the original device.
With DBSC enabled, Chrome requires proof that the device possesses the corresponding private key before issuing or refreshing session cookies. Additionally, the cookies are short-lived, significantly reducing their value if intercepted. Even if attackers manage to exfiltrate these cookies, they cannot renew or reuse them without access to the device-bound private key, effectively neutralizing traditional cookie theft techniques.
Google emphasized that the implementation is designed to be developer-friendly, allowing websites to adopt DBSC by adding dedicated registration and refresh endpoints to their backend systems. The browser handles the complex cryptographic processes in the background, ensuring compatibility with existing web applications while maintaining a seamless user experience.
The company has already tested earlier versions of the protocol across its own services over the past year, reporting a measurable reduction in session hijacking incidents. This demonstrates the effectiveness of hardware-bound session security in mitigating one of the most persistent threats in web authentication.
Privacy has also been a key consideration in DBSC’s design. Each session is associated with a unique cryptographic key, preventing websites from tracking users across sessions or correlating activity across different platforms. Importantly, the protocol does not transmit device identifiers or attestation data, ensuring that it cannot be used for device fingerprinting or cross-site tracking.
DBSC was developed through the World Wide Web Consortium (W3C) standards process and adopted by the Web Application Security Working Group. Google collaborated with Microsoft on the protocol’s design and conducted multiple Origin Trials to refine its implementation. Okta was among the companies that participated in testing and provided feedback on its enterprise applicability.
Looking ahead, Google plans to expand DBSC capabilities in several key areas. These include support for federated identity systems such as Single Sign-On (SSO), enabling continuous device-bound authentication across multiple services. The company is also working on advanced registration mechanisms that can integrate with existing trusted credentials, such as hardware security keys and mutual TLS certificates.
In addition, Google is exploring software-based alternatives to extend DBSC protections to devices that lack dedicated secure hardware, ensuring broader adoption across diverse environments.
As cyber threats targeting authentication systems continue to evolve, Google’s introduction of Device Bound Session Credentials represents a significant step toward strengthening session security. By eliminating the usability of stolen cookies and reinforcing authentication at the device level, DBSC sets a new benchmark for secure web interactions.
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