Google has introduced a new security feature in Chrome designed to counter an expanding category of account takeover attacks that exploit session cookies. This protection, called device-bound session credentials (DBSCs), leverages hardware security components built into modern devices to protect sensitive authentication data.
The mechanism works by storing encryption keys in dedicated hardware security modules. Windows machines contain a component called a Trusted Platform Module (TPM), while Apple devices feature a secure enclave. These isolated hardware areas prevent unauthorized extraction of the private keys used to validate session credentials.
Session cookies have become an increasingly attractive target for attackers as users have adopted stronger authentication methods like two-factor authentication and passkeys. These advanced protections make traditional attack vectors such as phishing ineffective, prompting threat actors to shift toward stealing session cookies using infostealer malware or man-in-the-middle attacks. Once obtained, attackers can paste stolen cookies into their own browsers to gain unauthorized access. DBSCs address this vulnerability by requiring that stolen cookies be cryptographically signed with a key that remains locked within the device hardware.
Currently, the feature is limited to Chrome version 147 on Windows and version 150 on macOS, and is being tested with a restricted user population. Users can verify whether the protection is active through the browser’s developer tools. Industry observers anticipate that other Chromium-based browsers will eventually adopt similar protections, though implementation timelines remain uncertain.
This development represents a broader shift toward authentication systems that do not depend on shared secrets. Under the new model, servers store public keys and issue authentication challenges that must be signed by private keys secured within device hardware—a pattern similar to passkey authentication systems.
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