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To quote from the paper you linked: The above particular values of $\mathrm{opad}$ and $\mathrm{ipad}$ were chosen to have a very simple representation (to simplify the function’s specification and minimize the potential of implementation errors), and to provide a high Hamming distance between the pads. The latter is intended to exploit the mixing ...


I understand the system as follows: data blocks are enciphered per AES-CTR, using key encryption_key, with an IV made by concatenating device_id and a counter held in Flash or EEPROM, incremented at each use; that enciphered data is integrity-protected by a 256-bit mac_tag computed using HMAC-SHA256 and mac_key. That's theoretically sound if device_id ...

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