NXP Kinetis K60 (Cortex-M4) uses flash protection bits. Kinetis decryption bypasses protection to recover firmware.

Kinetis Protection:
- FPROT/FSEC bits lock flash read.
- Debug access via SWD/JTAG disabled.
- Setting unprotected state erases flash.
- Backdoor key unlock exists but is unknown.

Kinetis Decryption Methods:
1. Voltage Glitching: glitch VDD during FSEC check.
2. Clock Glitching: fault flash controller.
3. Optical Decapsulation: read die directly.
4. Backdoor Key Brute Force: on unlocked parts.

Kinetis decryption is used for industrial, automotive, and IoT product backup and repair.