Zero Width Unicode Standard (ZWUS)

Zero Width Unicode Steganography — hide text inside invisible characters.

npm install zwus

Usage

import zwus from 'zwus';

// Encode & decode strings
const hidden = zwus.encodeString("secret");
const revealed = zwus.decodeToString(hidden);
// "secret"

// Encode & decode number arrays
const encoded = zwus.encodeNumberArray([72, 101, 108]);
const decoded = zwus.decodeToNumberArray(encoded);
// [72, 101, 108]

Base

Base 7 ranks printable ASCII so common English characters use one or two digits. Base 6 keeps Unicode code points as numbers. Some platforms strip particular zero-width characters.

zwus.encodeString("hi", 3)  // safest
zwus.encodeString("hi", 6)  // code point encoding
zwus.encodeString("hi", 7)  // default, compact for ordinary English text

Decode must match the encode base:

zwus.decodeToString(encoded, 6)

Number arrays use ordinary base digits in every standard. Base 7's frequency ranking applies only to strings. Decoding ignores visible text mixed into a payload.

Interop

Encoded output is byte-identical to the Rust crate, so you can encode in JS and decode in Rust or vice versa.

License

WTFPL

Browser Extension

You can also use ZWUS in your browser with inØsight: Firefox Add-on · Chrome Web Store