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STSAFE-A120 Datasheet(PDF) 13 Page - STMicroelectronics

Part # STSAFE-A120
Description  Secure authentication companion device for consumables, accessories, and connected objects
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STSAFE-A120 Datasheet(HTML) 13 Page - STMicroelectronics

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Figure 11. Host secure channel setup case for plaintext host keys provisioning
IoT device
Local host
I2C
STSAFE-A120
Requests 128-bit
random number for
host’s C-MAC key
Stores keys securely
Requests 128-bit
random number for
host’s cypher key
1. Generate random (16 bytes)
128-bit random
2. Generate random (16 bytes)
128-bit random
Concatenates
host’s C-MAC and
cypher key
3. Put attribute
(Host key, concatenated keys, key slot number)
Checks that
host’s key slots are
empty and store
received keys
OK
Operation to be done in a trusted environment
STSAFE-A120
Pairing with local host
DS14609 - Rev 1
page 13/38



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