Device Bound Session Credentials (DBSC) make a copied login cookie harder to reuse on another device. Chrome keeps a private key in protected device storage, and a participating website can require Chrome to prove possession of that key when renewing a session. Chrome for Windows supports DBSC; it helps limit remote replay of stolen cookies, but it does not stop malware that can still operate through your browser.
What Device Bound Session Credentials do
A conventional session cookie is a bearer credential: whoever has a usable copy may be able to present it as proof of an existing login. That makes cookies valuable to infostealer malware, which can extract them and send them to an attacker for replay elsewhere.
DBSC adds a device-held key to the session. During registration, Chrome creates a key pair for that session and gives the website the public key. The private key stays in protected browser or device storage. Later, when the site needs to renew the session, it can ask Chrome to sign a challenge with that private key. A copied cookie without the key cannot complete that proof.
Google’s Chrome for Developers announcement describes DBSC as available in Chrome 145 on Windows, with TPM-backed protection for the private key. Google Workspace Updates reported general availability in Chrome for Windows on 28 May 2026. Support on other operating systems and in other browsers is platform- and rollout-dependent; check current browser documentation rather than assuming it is available everywhere.
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How a website uses DBSC
DBSC works alongside ordinary web cookies rather than replacing cookies for every request. A site has to add registration and refresh endpoints, keep track of the public key associated with a session, and issue short-lived cookies so that a session can be renewed only after the proof succeeds.
- Register the session. After a user signs in, the server sends a
Secure-Session-Registrationresponse header to start registration. - Create and register a key. Chrome generates a per-session key pair and posts the public key to the site’s registration endpoint. The private key remains on the user’s device.
- Configure renewal. The site stores the public key and sets up a refresh endpoint. It uses short-lived, DBSC-managed cookies for the session.
- Prove possession when renewal is needed. While the session is actively being used, Chrome contacts the refresh endpoint. The server may issue a challenge, which Chrome signs with the private key.
- Issue or deny a fresh cookie. If the proof checks out, the server can issue a new cookie. If it does not, the server can refuse renewal.
This approach can let an application retain its normal cookie-based requests without rebuilding its entire sign-in flow. It still requires the site to implement and operate the endpoints correctly. Chrome’s implementation guidance also describes circumstances in which it may skip DBSC operations and send requests without a DBSC-managed short-lived cookie, so sites need a deliberate fallback rather than assuming every request includes a proof.
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What happens if a cookie is stolen
If malware exports only the cookie, an attacker trying to use it from another machine normally will not have the corresponding private key. The attacker therefore cannot complete the proof required to renew the session, and the short-lived cookie loses value as it expires. This makes remote replay of an exported cookie less useful and can make session cleanup more effective after malware has been removed.
DBSC is not a guarantee that a compromised device or account is safe. Google notes that a browser and operating system cannot fully protect cookies from malware with access comparable to the browser’s own. Malware that remains active on the device may still use the victim’s open browser session. DBSC primarily raises the barrier to taking a cookie off the device and replaying it remotely; it does not remove malware or prevent every form of local account misuse.
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What DBSC means for users and website operators
For users
- DBSC protects an existing session against a particular threat—exported-cookie replay. It does not replace strong sign-in measures such as passkeys or multifactor authentication, which help protect the sign-in itself.
- Google says each session uses a unique key, so DBSC is not designed to give websites a persistent identifier that tracks a device across sessions.
- Deleting a site’s data removes its DBSC keys. Refresh occurs only while the session is actively being used.
- After a suspected infostealer infection, remove the malware and review or revoke affected sessions. Device binding is not a substitute for cleaning a compromised device.
For website operators
- Implement the registration and refresh endpoints and bind the stored public key to the appropriate session.
- Use short-lived cookies and verify the signed challenge before issuing a fresh credential.
- Design for supported and unsupported clients, including the cases in Chrome’s guidance where DBSC operations may be skipped.
- Do not assume a browser feature is universal: the cited availability is Chrome on Windows, and support elsewhere can vary by platform and rollout.
Is DBSC a web standard?
The W3C published a First Public Working Draft of the Device Bound Session Credentials specification on 21 August 2025. It describes a protocol in which a user agent demonstrates possession of a securely stored private key so a server can detect whether a session credential has been exported. A working draft defines a proposed protocol; it does not mean that every browser or operating system implements it.
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