Secure Secret Provisioning SSP is the final step in production programming and is designed to protect the MPU from unwanted access to registers or running unauthorized software. The SSP procedure is to write secret data and keys to the OTP using files properly prepared by the OEM. Elprotronic ST-Gangflasher software offers the possibility to write OTP according to the SSP procedure developed by STMicroelectronics on many MPUs simultaneously (Gang programming) which is beneficial for the production of a large number of devices.
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Useful links
STMicroelectronics application notes and user manuals:
[1] AN5054 - Secure programming using STM32CubeProgrammer
[2] AN5156 - Introduction to STM32 microcontrollers security
[3] AN5275 - USB DFU/USART protocols used in STM32MP1 Series bootloaders
[4] AN5510 - Overview of the secure secret provisioning (SSP) on STM32MP1 Series
[5] UM2238 - STM32 Trusted Package Creator tool software description
[6] UM2543 - STM32MP1 Series Signing Tool software description
STMicroelectronics sites:
[7] STM32Trust