3 ms·

Given the lack of I/O, probably not (or perhaps in not thinking creatively enough). But you can get microcontrollers for less than a dollar anyway... Relatedly

Given the lack of I/O, probably not (or perhaps in not thinking creatively enough). But you can get microcontrollers for less than a dollar anyway... Relatedly, I remember the eyeFi (or similar) wifi-enabled SD cards got 'hacked' a few years ago, and you could get a Linux shell on them.

int_19h 8y ago
I mean, it still does have I/O, it just needs to present itself as a regular SD card. So computation could be triggered by e.g. changing the contents of a file with a certain name, and output would be another file. One immediate practical application is a hidden cryptographic partition on an SD card. It could be implemented in a way such that during normal use, no data shows up, and the corresponding blocks are marked as bad. But create a password file with the right content, and the firmware decrypts and exposes the hidden data. Since there's no way to read the firmware, only to update it, even detecting such a scheme would require tearing the SD card down in a lab - not really feasible for routine searches, given how many cards there are around (used in phones and tablets etc).