Purloined plot studio

A message goes in, a drawing comes out. The encoders, carriers and hiding modes are the ones from Unravel the Purloined, so what you plot is a real pattern: a knitter can work it and the UTP decoder can read it back. Pick how the message is written, how it hides, and how it is drawn, then shade it for the pen.

Starting points

The message Say Written as Five-bit error checks (chart layouts) Classical cipher first Cipher key

Classical ciphers are historical puzzles, not modern security.

Layout and hiding Layout Carrier Border Width in stitches (chart, tape) Letters per line (columns) Scatter density Seed (scatter route, wobble)

Drawn as Look Cell boxes / grid Fabric gaps (stitches) Hand wobble Largest cell (mm)

Shading Fill for marks Pitch (mm) Angle (deg) Blank cells

Fill shades the marks: dots, holes, blocks, purl bumps, colour B, beads and bobbles. Truchet shades every quarter disc, so the fill never gives the bits away.

Caption and key Below the drawing Letter height (mm) Text pen preview Answer key layer Answer key pen preview

Paper Page Machine marks (for the camera decoder) Mount window, mm in from the edge (for "under a mount") Corner ticks

Split export saves one SVG per pen that has line (outline, fill, text, reveal), numbered in plotting order, each with the same four corner ticks so Design Space places them alike. Plot the answer key on a tracing-paper overlay if the page itself should keep its secret.

drawing

Encoders, carriers, hiding and the decode check come from the UNRAVEL THE PURLOINED engine at repo commit dev, bundled in by 02_WORK/plg-stego/build.mjs, so the chart layouts are exactly what the UTP lab makes. Stitches follow UTP's fabric renderer, redrawn as outlines with vector hidden lines: each stitch is cut wherever a stitch drawn after it covers it. Pens: black 0.4 for outlines, black 0.3 for shading, a text pen, and an optional answer key pen. In Design Space: every layer to Pen, Attach, Make.