Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ("Oops! Had the silly thing in reverse")---Optical injection attacks in
  through LED status indicators   It is possible to attack a computer remotely through the front panel LEDs.
Following on previous results that showed information leakage at optical
wavelengths, now it seems practicable to inject information into a system as
well. It is shown to be definitely feasible under realistic conditions (by
infosec standards) of target system compromise; experimental results suggest it
further may be possible, through a slightly different mechanism, even under
high security conditions that put extremely difficult constraints on the
attacker. The problem is of recent origin; it could not have occurred before a
confluence of unrelated technological developments made it possible.
Arduino-type microcontrollers are involved; this is an Internet of Things (IoT)
vulnerability. Unlike some previous findings, the vulnerability here is
moderate---at present---because it takes the infosec form of a classical covert
channel. However, the architecture of several popular families of
microcontrollers suggests that a Rowhammer-like directed energy optical attack
that requires no malware might be possible. Phase I experiments yielded
surprising and encouraging results; a covert channel is definitely practicable
without exotic hardware, bandwidth approaching a Mbit/s, and the majority of
discrete LEDs tested were found to be reversible on GPIO pins. Phase II
experiments, not yet funded, will try to open the door remotely.

22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc