Is cryptography possible on arduino?

Question

Arduino

There is an arduino, a camera for it and a slot for an sd card. Will MK have enough strength if you write an algorithm by which he takes pictures, encrypts the photo and sends it to the sd card? Decryption will be done already on the PC.

Answer 1

There are very fast and even streaming encryption algorithms. If you take some kind of scrambler, then the speed will be enough for sure.

Answer 2

everything will depend on the time you are willing to wait and the complexity of the algorithm. Basically, why not?

Answer 3

Enough.

Answer 4

There is no need for crutches, here are a few reasons why the duina has nothing to do in this task:
1. Little brains - slowly photographs, slowly encrypts, slowly transmits, etc.
2. Poor photo quality - the sensors that are connected to it in quality are approximately the same as on ancient mobile phones 10-15 years old, at best 640x480 with a noise level in the light as in complete darkness
3. In view of points 1 and 2, practical use is doubtful, yes and the theoretical value is small
4. You need to kill time for porting algorithms
5. A small amount of RAM, you will have to forget about many good algorithms, and those that remain will not protect anyone

Answer 5

To work with images, you need to process pixels. Each pixel is RGB (24 bits).
The AVR8 microcontroller is 8-bit, that is, it works with bytes (8 bits). To simply copy a pixel, it needs to perform 3 copy operations.
Therefore, a 32-bit microcontroller is more suitable for such tasks.

Answer 6

Arduino is a platform, you can compile for different chips - AVR8bit, AVR32bit, ESP, STM32, choose according to performance and go ahead.
You connect the library, write the code in which you sequentially:

1. get a photo from the camera
   
2. you encrypt
   
3. write to flash
   

and watch the frame rate, which will depend on the cost of operations (reading, encryption, writing), on the performance of the MK (frequency, bit depth).
Either from Guyver: alexgyver.ru(arduino-libraries) , there is CryptoSuite and AESlib