Delivering data from a secure execution environment to a display controller

摘要

Methods and systems may include a computing system having a display, a display controller with a decryption module, and a security element with security logic. The security logic can be configured to establish a secure path between the secure element and the display in response to a secure output mode request, wherein the secure path includes the display controller. In addition, the security logic may be configured to prevent the decryption module from being bypassed, and transmit encrypted data from the secure element to the display via the secure path.

主权项

1. A computer implemented method comprising:
establishing a secure path between a secure element and a display in response to a secure output mode request, wherein the secure path includes a display controller; preventing a decryption module of the display controller from being bypassed; and transmitting encrypted data from the secure element to the display via the secure path; wherein establishing the secure path includes:
writing a key to a hardware buffer, wherein the hardware buffer is invisible to one or more host applications;writing a key program command to the hardware buffer, wherein the key program command includes an instruction to program the key into a hardware register of the display controller; andissuing an interrupt.