Hacking crypto in hardware devices poses unique challenges, including securing firmware updates, authentication and authorization, and cryptographic key management. Side-channel attacks exploit unintended information leaks from a system, such as power consumption or electromagnetic emissions, to extract sensitive information. These attacks can be performed with minimal tools, making them accessible to bug bounty hunters new to hardware hacking. DPA is generally more complex but can yield impressive results with the right tools and persistence. Hardcoded encryption keys in firmware are vulnerable to extraction through reverse engineering and memory analysis, which can be done using various tools like binwalk, IDA Pro, and Ghidra. Fault injection attacks involve disrupting a device's operation to force it into an exploitable state, such as voltage glitching or electromagnetic fault injection. Unprotected debug interfaces like JTAG and UART provide opportunities for juicy findings, while insecure firmware and software updates enable rollback attacks and backdoors. Devices without proper cryptographic authentication are vulnerable to replay attacks and spoofing, making them susceptible to unauthorized access and data modification. Real-world examples include the Trezor One vulnerability, Ring doorbell hack, Medtronic insulin pump vulnerabilities, Juniper Dual_EC_DRBG backdoor, and gas station controller weaknesses.