Run apps - Runtime Tooltip: Do you want to run apps? The runtime includes everything you need to run. NET applications. The runtime is also included in the SDK. NET Core Runtime 5. NET Core Module v2 NET Core 5. NET Desktop Runtime 5. Downloads for. NET Runtime 5.
Release notes Latest release date October 12, Release notes Latest release date August 10, Release notes Latest release date June 8, Release notes Latest release date May 25, A user certificate need not be signed by the private key of the root CA. It could be signed by the private key of an intermediary whose certificate is signed by the private key of the CA. This is an instance of a three-certificate chain: user certificate, intermediary certificate, and CA certificate.
But more than one intermediary can be part of the chain, so certificate chains can be of any length. You would need to pick hardware for Secure Boot key management like Hardware Security Modules HSMs , consider special requirements on PCs to ship to governments and other agencies and finally the process of creating, populating and managing the life cycle of various Secure Boot keys.
Figure 3 above represents the signatures and keys in a PC with Secure Boot. The platform is secured through a platform key that the OEM installs in firmware during manufacturing. Other keys are used by Secure Boot to protect access to databases that store keys to allow or disallow execution of firmware.
The authorized database db contains public keys and certificates that represent trusted firmware components and operating system loaders. The forbidden signature database dbx contains hashes of malicious and vulnerable components as well as compromised keys and certificates and blocks execution of those malicious components.
PKI is a well-established process for creating, managing, and revoking certificates that establish trust during information exchange. PKI is at the core of the security model for Secure Boot. As per section The platform owner enrolls the public half of the key PKpub into the platform firmware as specified in Section 7. This step moves the platform into user mode from setup mode. Public keys are used to check signatures as described earlier in this document.
The platform owner can later use the private half of the key PKpriv :. If the platform is in setup mode, then the new PKpub shall be signed with its PKpriv counterpart. If the platform is in user mode, then the new PKpub must be signed with the current PKpriv. If the platform is in setup mode, then the empty variable does not need to be authenticated. If the platform is in user mode, then the empty variable must be signed with the current PKpriv ; see Section 7.
It is strongly recommended that the production PKpriv never be used to sign a package to reset the platform since this allows Secure Boot to be disabled programmatically. This is primarily a pre-production test scenario. The platform key may also be cleared using a secure platform-specific method. In this case, the global variable Setup Mode must also be updated to 1. As per UEFI recommendations, the public key must be stored in non-volatile storage which is tamper and delete resistant on the PC.
There are more details under section 2. These keys could be:. One per PC. Having one unique key for each device.
This may be required for government agencies, financial institutions, or other server customers with high-security needs. It may require additional storage and crypto processing power to generate private and public keys for large numbers of PCs. This adds the complexity of mapping devices with their corresponding PK when pushing out firmware updates to the devices in the future. One per model. Having one key per PC model. The tradeoff here is that if a key is compromised all the machines within the same model would be vulnerable.
This is recommended by Microsoft for desktop PCs. One per product line. If a key is compromised a whole product line would be vulnerable. One per OEM. While this may be the simplest to set up, if the key is compromised, every PC you manufacture would be vulnerable.
To speed up operation on the factory floor, the PK and potentially other keys could be pre-generated and stored in a safe location.
These could be later retrieved and used in the assembly line. Chapters 2 and 3 have more details. This may be needed if the PK gets compromised or as a requirement by a customer that for security reasons may decide to enroll their own PK.
Rekeying could be done either for a model or PC based on what method was selected to create PK. All the newer PCs will get signed with the newly created PK. Updating the PK on a production PC would require either a variable update signed with the existing PK that replaces the PK or a firmware update package.
The firmware update package would be signed by the secure firmware update key and verified by firmware. If doing a firmware update to update the PK, care should be taken to ensure the KEK, db, and dbx are preserved. On all PCs, it is recommended to not use the PK as the secure firmware update key.
If the PKpriv is compromised then so is the secure firmware update key since they are the same. In this case the update to enroll a new PKpub might not be possible since the process of updating has also been compromised.
This is because the secure firmware update key is permanently burnt into fuses on PCs that meet Windows Hardware Certification requirements. Each operating system and potentially, each 3rd party application which need to communicate with platform firmware enrolls a public key KEKpub into the platform firmware.
Key exchange keys are stored in a signature database as described in 1. The signature database is stored as an authenticated UEFI variable.
The platform owner enrolls the key exchange keys by either calling SetVariable as specified in Section 7. If the platform is in setup mode, the signature database variable does not need to be signed but the parameters to the SetVariable call shall still be prepared as specified for authenticated variables in Section 7. Unlock 1 Answer and 2 Comments. Andrew Hancock - VMware vExpert. See if this solution works for you by signing up for a 7 day free trial. What do I get with a subscription?
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An ISO file combines all the Windows installation files into a single uncompressed file. This allows you to install Windows onto your machine without having to first run an existing operating system. Please see the documentation for your computer for information about how to change the BIOS boot order of drives.
The license terms for Windows permit you to make one copy of the software as a back-up copy for re-installation on the licensed computer. If you do not delete your copy of the ISO file after installing the Windows software, the copy of the ISO file counts as your one back-up copy.
If you need to download the software again, you can go to your Download Purchase History in your Microsoft Store account and access the download there. Follow the steps in the setup dialogs.
It requires the Microsoft. NET Framework version 2. NET Framework 2. It can be downloaded here. Click NEXT.
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