One of your customers is concerned about security on their Android devices, specifically in regards to key generation, key import, signing & verification services. Which of the following security features of Android can you leverage as a good starting point for your conversation?

The Trusted Execution Environment (TEE) is the most relevant security feature here because it provides a secure, isolated environment for sensitive operations like key generation, key import, signing, and verification. It ensures that cryptographic keys and operations are protected from the main Android OS, even if the OS is compromised. Verified Boot ensures the integrity of the boot process but doesn't directly handle key operations. Rollback Prevention prevents downgrades to older, potentially vulnerable software versions, which is important for overall security but not specific to key management. Application Sandboxing isolates apps from each other, preventing malicious apps from accessing data of other apps, but the TEE offers a deeper level of hardware-backed security for cryptographic functions.