4 ms·
They address the security possibilities in the paper: > Our current implementation does not account for security. However, to secure the wireless link between
by CreepGin 8y ago
They address the security possibilities in the paper:
> Our current implementation does not account
for security. However, to secure the wireless link between
the camera and reader, we can leverage the fact that our
digital core processes the PWM signal. Each wireless
camera can be assigned a unique pseudo random security
key. Based on this key, the camera’s digital core can
modulate the width of the PWM-encoded pixel value
using an XOR gate. The reader, which knows the security
key, can map the received data to the desired pixel values
by performing the analogous operation.
- cm2187 8y agoXOR encryption with a mostly static image doesn’t seem very secure to me.
- jacobush 8y agoIf the static image could be somehow "bankswitched", "shifted" or updated... I am thinking a huge one time pad. The problem is doing it power effeciently of course.
- cm2187 8y agoThinking about, the main problem will be the penguin problem [1]. Which for a video is even worse as if a shape is moving, from seeing the pixels that are changing you can tell most of what is going on. [1] https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_(ECB) https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation...
- CreepGin 8y agoIn my mind, strong encryption that can fend off the most serious attackers cannot apply to the analog part of the application. However, analog scrambling techniques should still be effective in many cases.
- Robin_Message 8y agoIt's XORed with a stream cipher, so it's totally secure (no part of the stream is reused). The tricky bit might be deciding where to start the stream...