An Arduino is by no means expensive, but that still doesn't mean that it suits your needs right out of the box. If you want to make your own custom board, Make shows you how in a three-part series.

Arduino has shrunk the UNO R4 with the Arduino Nano R4 board equipped with the same 48 MHz Renesas RA4M1 32-bit Arm ...

There is also hardware AES acceleration built with side band attack protection as well as hardware support for Public Key Cryptography. The FRDM-K82F development board can be used with expansion ...