![]() ![]() In order to import new transport key sets, a secure channel must be established with the security domain. The BMK could be protected by the YubiHSM2. If the CMS vendor gives Yubico access to its BMK, Yubico can preprogram the secure channel transport key sets for the YubiKey 5 batches. ![]() To derive the YubiKey transport key sets, the Batch Master Key (BMK) is shared with the CMS system. ![]() Key diversification therefore facilitates secure distribution of key sets over a secure channel. Key diversification is the process of deriving a secure channel static transport key set from a Batch Master Key (BMK), the YubiKey identifier (part of serial number), and additional metadata. When a session is established, the session AES keys are derived from the long-lived transport key set. A transport key set contains three long-lived AES keys. The YubiKey security domain can store three concurrent transport key sets. The features, capabilities, and enhancements brought to the YubiKey 5 Series by the various firmware versions are summarized below, with the full details given in the technical description sections in this manual. ![]() The capabilities of the firmware versions 5.2.3 and earlier are included in the general descriptions in Protocols and Applications. YubiKey Manager (ykman) CLI & GUI Guideĭepending on when it was manufactured, the firmware on a YubiKey 5 Series key will be in one of three ranges: 5.1.1 - 5.2.2, 5.2.3 - 5.2.8 and 5.3.2 - 5.4.3.The YubiKey Manager has both a graphical user interface (GUI) and a command line interface (CLI). The quickest and most convenient way to determine your device’s firmware version is to use the YubiKey Manager tool (ykman), a lightweight software package installable on any OS. The firmware version on a YubiKey or an HSM therefore determines whether or not a feature or a capability is available to that device. Yubico periodically updates the YubiKey firmware to take advantage of features and capabilities introduced into operating systems such as Windows, MacOS, and Ubuntu, etc., as well as to enable new YubiKey features. Nonetheless, it can be neither removed nor altered. The YubiKey firmware is separate from the YubiKey itself in the sense that it is put onto each YubiKey in a process separate from the manufacture of the physical key. Firmware: Overview of Features & Capabilities ![]()
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