⌖ Uranometria

ARETHUSA

the Steganographia — a grimoire of cryptologic craft
στεγανός · covered // γράφειν · to write

The nymph who fled underground and surfaced as a hidden spring brings you the Steganographia — a working, expanding codex recast after Trithemius (c. 1499), who wrote a treatise on cryptography disguised as the summoning of spirits.

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Liber I

Concealment
f.001
THE CIPHER BENCH
Shift · Atbash · Vigenère · Transposition
Caesar shift, Atbash, keyed Vigenère over a live tabula recta, and columnar transposition — with frequency analysis and index of coincidence on every input.
liveOPEN →
 f.002
SOLITAIRE
Schneier 1999 · Pontifex
A stream cipher run by hand on a deck of cards — the keystream, the keying methods, an animated bench, and the bias that made it famous and undid it.
liveOPEN →
 f.003
LC4 · ELSIEFOUR
Kaminsky 2017 · tile grid
A 6×6 tile grid that rearranges as you encrypt — with a nonce so one key survives many messages, and by-hand authentication. The modern answer to Solitaire.
liveOPEN →
 f.004
SECRET SHARING
Shamir 1979 · Quorum
Split a secret so any k of n keepers can return it, and any fewer learn nothing at all — the geometry of trust, worked on a live constellation and over a real finite field.
liveOPEN →

Liber II

Cryptograms
f.005
KRYPTOS
Sanborn sculpture · K1–K4
Keyed Vigenère for K1–K2, the K3 double transposition, and a crib + frequency bench for the unsolved K4.
liveOPEN →
 f.006
LIBER PRIMUS
Cicada 3301 · Gematria Primus
The 29-rune alphabet with Atbash, shift, and keyed runic Vigenère — verified against the known solved pages.
liveOPEN →

Liber III

Operational
f.007
THE KEY FORGE
OpenPGP · sign · verify
Forge a keypair in the browser; publish the public key beside the gate. Verify any signed leaf. Self-hosted, never a CDN.
sealedv1 rests →
f.008
POST-QUANTUM
ML-KEM · ML-DSA · hybrid
Verify a quantum-resistant signature and encapsulate with ML-KEM — an optional second seal beside PGP, so the binding survives Q-day. Lattice math; vendored, never a CDN.
sealedv1 rests →
f.009
ZERO-KNOWLEDGE
Prove · without revealing
Prove you solved the gate without ever showing the plaintext. “Hidden = earned,” made cryptographic — the proof reveals nothing, so it is safe in the open.
sealedv1 rests →
f.010
THE CIPHER NEXT DOOR
Meshtastic · AES-256-CTR
The exact cipher MURMURATION runs on: AES channel encryption with the header left in clear so nodes relay blind, and Curve25519 keys held trust-on-first-use. Demonstration only.
sealedv1 rests →
f.011
STEGANOGRAPHY
Hide · in plain sight
The literal steganos — conceal a message inside an image or a cover text, then recover it. The art the whole codex is named for.
sealedv1 rests →
apparatus criticus · trust nothing unsigned
THE APPARATUSsealed · v1 rests

The reader’s bench. Verify any leaf against its own signature and Bitcoin-anchored timestamp; consult the register of what is sealed, and when; contact details for those interested.