joac...@secworks.se writes: > Aloha!
Aloha auinala. > Hilarie Orman wrote: > > An ARM is far too much hardware to throw at "read sensor/munge > > data/send data". > No, they are not. The Cortex M0+ is aimed at these kinds of very simple > systems that runs for many years on a single battery. > Look at the STM32L0 series from ST for example. These devices can run on > energy harvesting and very tiny physically and very, very cheap (ten-ish > cents in high volume): > > http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32l0-series.html?querycriteria=productId=SS1817 > The STM32L021 has an AES-128 core. Not very fast (200+ cycles), but > several times faster than SW. You can also run the AES core wile the CPU > core is in power save mode. > Another example is the Zero Gecko from Silicon Labs. Same price range, a > huge number of power modes. And an AES core that is really fast. 50+ > cycles for AES-128, which basically means 4 cycles/round (which implies > 4 S-boxes) > > https://www.silabs.com/products/mcu/32-bit/efm32-zero-gecko/pages/efm32-zero-gecko.aspx For devices you refer to, how many AES blocks can they encrypt on a AA battery, assuming that the usage is to encrypt one block every 10 minutes? Hilarie _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
