Understanding BadUSB: Principles and Examples Using Arduino and AVR Libc

Understanding BadUSB: Principles and Examples Using Arduino and AVR Libc

* Original Author: Niqiao Security. This article is part of the FreeBuf original reward program. Reproduction without permission is prohibited. 1. Introduction In 2014, at the Black Hat conference in the United States, researchers Jakob Lell and Karsten Nohl presented the attack method of BadUSB. Although there have been some articles related to BadUSB in … Read more

Understanding ARM TrustZone Architecture for Enhanced Security

Understanding ARM TrustZone Architecture for Enhanced Security

Official Block Diagram 1. ARMv7 2. ARMv8 (1) aarch32 (2) aarch64 (3) Summary of arch32 and aarch64 (4) Understanding with Code 3. Cortex-A9 architecture 1. ARMv7 2. ARMv8 (1) aarch32 (2) aarch64 (3) Summary of arch32 and aarch64 Understanding aarch32 and aarch64 under armv7: If both secureos and monitor are 64-bit, secureos runs at el1, … Read more