Encryption hides the contents of a message. Geometric cryptography hides the existence of it.
Acetilt encodes a secret message into the least-significant bits of a carrier image's blue channel at pixel locations defined by a lattice — a periodic grid generated from a 2×2 integer matrix B.
In Advanced mode, the lattice is also rotated by an angle θ. Recovery requires both B and θ. Neither alone is sufficient.
The cryptographic key is the pair (B, θ). Security arises from the combinatorial explosion of valid basis matrices and the 360 discrete orientations — not from secrecy of the algorithm.
This satisfies Kerckhoffs's principle: the method is public; only the key need be secret.
Detectability: recovery of the payload requires the key (B, θ) and is the proven security property. Resistance to detection has been tested only against common off-the-shelf steganalysis; it has not been evaluated against purpose-built statistical steganalysis (e.g. RS or chi-square analysis of the LSB distribution). Treat existence-hiding as unproven pending that testing.
An AI agent embedded in an image. One use. Then gone. No server to call, no key to revoke.
AI / DefenceA photo posted publicly contains a classified briefing. Carries no visible marker to casual or automated inspection. No trace surfaced by the standard tools we tested.
Intelligence / JournalismYour Bitcoin seed phrase lives inside a holiday photo. Encrypt the payload first, then embed — geometry hides, cipher protects. Not recommended as sole protection for high-value secrets without additional encryption of the payload before embedding.
Crypto / FinanceOne image. Three payloads. Each clearance level unlocks a different reality.
Defence / GovernmentA proprietary trading model hidden inside a stock chart. The geometry is the licence. Wrong key, wrong model.
Finance / QuantAuthentication embedded inside the asset itself. No blockchain lookup. No external server.
Legal / NFTExecution keys embedded in images. Use-count-bounded. Silent failure on expiry.
Software / AITamper-evident audit trails embedded in documents using geometric signatures.
Legal / FinanceSource and journalist share an image publicly. The story is hidden at an orientation only they know.
Press / ActivismPayload conceals a document inside an image using geometric encoding. Upload a Word document or rich text file up to 200KB. The file is converted to binary, embedded at lattice coordinates across a generated carrier image, and downloaded as an ordinary PNG. Evades common off-the-shelf steganalysis tools in our testing. To decode, upload the image and the original file reconstructs exactly. For this demo, document formats only — the technology supports any file type, including small AI models and lightweight agents. We've kept executables and scripts out of the playground.