US Patent 11657157 Secure boot system, method and apparatus

A secure boot system, a secure boot method, and a secure boot apparatus, adapted for a boot apparatus to boot a host device, are provided. The boot apparatus includes a storage device and a processor. In the method, the processor reads a boot code and a boot key for booting the host device from the storage device, and executes a cryptographic algorithm on the boot code by using the boot key to obtain a runtime signature. Besides, the processor reads an original signature from a secure area in the storage device and uses the same to verify the runtime signature. If the runtime signature and the original signature are consistent with each other, the processor provides the boot code for the host device to execute a boot operation.