Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Covert Message Passing over Public Internet Platforms Using Model-Based
  Format-Transforming Encryption   We introduce a new type of format-transforming encryption where the format of
ciphertexts is implicitly encoded within a machine-learned generative model.
Around this primitive, we build a system for covert messaging over large,
public internet platforms (e.g., Twitter). Loosely, our system composes an
authenticated encryption scheme, with a method for encoding random ciphertext
bits into samples from the generative model's family of seed-indexed
token-distributions. By fixing a deployment scenario, we are forced to consider
system-level and algorithmic solutions to real challenges -- such as
receiver-side parsing ambiguities, and the low information-carrying capacity of
actual token-distributions -- that were elided in prior work. We use GPT-2 as
our generative model so that our system cryptographically transforms plaintext
bitstrings into natural-language covertexts suitable for posting to public
platforms. We consider adversaries with full view of the internet platform's
content, whose goal is to surface posts that are using our system for covert
messaging. We carry out a suite of experiments to provide heuristic evidence of
security and to explore tradeoffs between operational efficiency and
detectability.

24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex