Teensy 3.5 & 3.6 by Paul Stoffregen — Kickstarter

Teensy are Arduino compatible microprocessor boards with a bit more oomph than Arduino. The new Teensies run on an ARM processor and at clock speeds above 100 MHz, while still beeing teensy in size.

The new Teens boards have a dedicated cryptographic co-processor that according to the PDFs linked below supports acceleration of the DES, 3DES, AES, MD5, SHA-1, and SHA-256 algorithms. So basically cryptographic hasing (SHA-256) and symmetric crypto (AES).

From the kickstarter page:

Technical Features & Specifications

Features specific to Teensy 3.6:

• 180 MHz ARM Cortex-M4 with Floating Point Unit
• 1M Flash, 256K RAM, 4K EEPROM
• Microcontroller Chip MK66FX1M0VMD18 (PDF link)
• USB High Speed (480 Mbit/sec) Port
• 2 CAN Bus Ports
• 32 General Purpose DMA Channels
• 22 PWM Outputs
• 4 I2C Ports
• 11 Touch Sensing Inputs

Features specific to Teensy 3.5:

• 120 MHz ARM Cortex-M4 with Floating Point Unit
• 512K Flash, 192K RAM, 4K EEPROM
• Microcontroller Chip MK64FX512VMD12 (PDF link)
• 1 CAN Bus Port
• 16 General Purpose DMA Channels
• 5 Volt Tolerance On All Digital I/O Pins

Features common to both:

• 62 I/O Pins (42 breadboard friendly)
• 25 Analog Inputs to 2 ADCs with 13 bits resolution
• 2 Analog Outputs (DACs) with 12 bit resolution
• 20 PWM Outputs (Teensy 3.6 has 22 PWM)
• USB Full Speed (12 Mbit/sec) Port
• Ethernet mac, capable of full 100 Mbit/sec speed
• Native (4 bit SDIO) micro SD card port
• I2S Audio Port, 4 Channel Digital Audio Input & Output
• 14 Hardware Timers
• Cryptographic Acceleration Unit
• Random Number Generator
• CRC Computation Unit
• 6 Serial Ports (2 with FIFO & Fast Baud Rates)
• 3 SPI Ports (1 with FIFO)
• 3 I2C Ports (Teensy 3.6 has a 4th I2C port)
• Real Time Clock