corpus

Corpus steganography — zero-modification cover selection via ANN search.

Usage

shadowforge corpus <COMMAND>

Subcommands

index

Build an index over a local image corpus.

shadowforge corpus index --dir <DIR> --output <FILE>

select

Select the best-matching cover from the corpus for a given payload.

shadowforge corpus select \
  --index <FILE> --payload <FILE> --output <FILE>

Examples

# Build a corpus index from a photo library
shadowforge corpus index --dir ~/Photos --output corpus.idx

# Find the cover whose existing LSB pattern best matches the payload
shadowforge corpus select \
  --index corpus.idx --payload secret.txt --output best-cover.png

How It Works

Instead of modifying a cover to embed data, corpus steganography searches a large collection of images to find one whose existing statistical properties naturally encode (or closely match) the payload bits.

This produces zero modifications to the selected cover, making steganalysis detection theoretically impossible — the cover has never been altered.

Requirement: This technique requires a sufficiently large corpus of cover images to find good matches. Effectiveness scales with corpus size.