AN3992 Datasheet, PDF (1/22 Pages) STMicroelectronics – Using an STM8L162M8 AES hardware accelerator with a CR95HF to encrypt contactless tag data memory

AN3992
Application note
Using an STM8L162M8 AES hardware accelerator with a CR95HF
to encrypt contactless tag data memory
Introduction
This application note describes STM8L162M8 demonstration firmware which reads and
writes encrypted data into an LRxk contactless tag. The MCU encrypts data using its
embedded AES hardware and sends it to a contactless tag through the CR95HF
transceiver.
The data stored into the contactless tag can be read by anyone but decrypted only by the
encryption or decryption key owner.
Figure 1. Data encryption diagram
SPI or UART bus
ISO/IEC 15693 RF
transaction
AES hardware
STM8L162M8
CR95HF
R^ISF^Oc¹o⁵m⁶⁹m³u^Rni^Fcation
LRxk
contactless tag
Plain data
Encrypted data
MS19972V1
April 2012
Doc ID 022369 Rev 3
1/22
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