VIC Cipher Workbench

Elimination status: widely tested, no signal

The VIC cipher and several variants have been tested against K4 at scale. Over 1.1 billion configurations were scored across standard VIC, non-standard key schedules, and straddling checkerboard variants. All produced noise-level results. VIC’s key inputs (a phrase, a date, a personal number and a five-digit group) can be almost anything, so this covers likely choices, not every possible key. This tool is retained for educational and historical reference. See the bespoke eliminations for details.

Full implementation of the VIC cipher (a sophisticated Soviet hand cipher) with optional layering of classical techniques. All computation runs locally in your browser. Nothing leaves this page unless you opt in below to share promising results.

What is the VIC cipher?

The VIC cipher was used by Soviet spy Reino Häyhänen (code name VICTOR) during the Cold War. It is a sophisticated hand cipher that combines a straddling checkerboard with columnar and disrupted diagonal transpositions, all keyed from a single set of inputs (phrase, date, personal number, keygroup).

Why test it on K4? Ed Scheidt (retired Chairman of the CIA Cryptographic Center) worked in Army signals intelligence and then spent 26 years at CIA (1963 to 1989), in the decades after VIC messages were found in 1953 and the cipher was explained following Häyhänen’s 1957 defection. At the 1990 dedication Sanborn said there are “two systems of enciphering the bottom text” (the lower panel holds both K3 and K4), and VIC is a real-world precedent for combining substitution (checkerboard) with multiple transpositions in a single hand-executable system.

K2 connection: The VIC cipher uses a straddling checkerboard with row labels derived from key generation. K2 contains coordinate-like numbers whose purpose in the broader Kryptos system is unknown; whether they relate to VIC-style parameters has not been established.

Standard workbench →

VIC Inputs

A Key Material

Phrase (20+ letters) Date (6 digits, e.g. DDMMYY) Personal Number (1–2 digits) Keygroup (5 digits) Top-row letters (8 high-frequency letters for row 0) Remaining letters (18 letters for rows 1–2, auto if blank)

B Ciphertext

Ciphertext (letters or digits)

Input is digit stream (skip checkerboard encode)

Letter-to-digit mapping (for decrypt when input is letters)

C Pipeline Options

Direction Skip checkerboard (use only VIC key gen + transpositions) Skip transpositions (use only checkerboard) Skip keygroup insertion/extraction

D Additional Layers (variant VIC)

Pre-VIC substitution Post-VIC substitution Alternative transposition (replace VIC’s columnar+diagonal) Null mask

-- noise

ENE -- BC -- IC -- Free --

Plaintext

Configure inputs and run to see results.

Match Miss

Checkerboard

Key generation

Transposition grids

Digit stream

Keystream at crib positions

History (0)

VIC cipher reference: VIC cipher (Wikipedia) · Number One From Moscow (CIA). Standard workbench →