This week we followed the composites class as part of the wildcard week. You can see video here.
I decided in this week to touch the topic of soft robotics trying to build some basic inflatable deformable structures the beginner way (…still far away to make soft robots).
This week we followed the machine design class. You can see video here.
For this assignment we decided to build a camera time-lapse dolly! :)
This page is about the 1st part of the process in the group comprised by: Ilias Bartolini, Marta Bocos, André Pulcino, Óscar González
This week we followed the mechanical design class. You can see video here.
For this assignment we decided to build a camera time-lapse dolly! :)
This page is about the 1st part of the process in the group comprised by: Ilias Bartolini, Marta Bocos, André Pulcino, Óscar González
This week we followed the Networking and Communication class(http://academy.cba.mit.edu/classes/networking_communications/index.html) (see video here)
This page is about the individual assignment.
The Privacy Seed random number generator doesn’t need to be a “cryptographically secure” pseudo-random number generator (CSPRNG) …but it would be really cool if it does :sunglasses:
Most modern CSPRNG use a combination of a stream block cipher (eg. AES) with a seeding & entropy accumulation mechanism to generate its key (usually these use some hash functions eg. SHA-family).
One of the challenges of modern CSPRNG implementations is to have good non-deterministic entropy sources: Here is where the heartbeat sensor is going to be useful!
A bit of research in the ares show that a couple of openly available solutions for CSPRNG are:
Some useful links:
The avr-libc library offers a Pseudo-Random Number Generator (PRNG) in form of a simple Linear Congruential Generator (LCG)).
Link: Random numbers on the arduino - part2
Link: Random numbers on the arduino - part1
This generation algorythm is not cryptographically secure and the leaves open the challenge to create a seed with a good amount of entropy.
A simple approach would be to just use the random() and randomSeed() functions provided by the arduino library (or directly AVR-libc) with the heartbeat as simple entropy source for the seed.
See: Arduino random() documentation.
To have a CSPRNG would require to port the ChaCha20 and entropy management, SHA-256 to AVR/Arduino using the Linux Kernel implementation as inspiration.
Raspberry Pi uses a linux kernel therefore could be easily possible to take advantage of the ChaCha20 implementation.
One simple solution would be to use the existing implementation and RNG-tools to add an heartbeat file to the entropy sources (eg. rngd -r /path/to/heartbeat/file).
This solution would also allow to run a simple web API/application on a pi-zero as interface.
…WORK IN PROGRESS….