Worked on the zephyrproject-rtos/mcuboot repository to enhance the image signing workflow by adding support for the ECDSA256P1Public key type in the image tool. This feature, implemented using Python and leveraging expertise in cryptography and embedded systems, updated the imgtool hashing logic to include accurate hash entries for ECDSA256P1Public keys. The approach ensures that only images signed with valid ECDSA256P1Public keys are accepted, improving security and aligning with public key infrastructure requirements. The work focused on scripting and cryptographic validation, reducing the risk of unsigned or invalid images being processed in embedded device firmware update pipelines.