We are excited to introduce 3-ark/ngram-cipher—a modern cryptographic steganography engine for JavaScript and TypeScript!
ngram-cipher transforms encrypted payloads into natural-sounding, syntactically coherent English prose (journalistic reports) or poetic verses that are 100% losslessly reversible.
Why N-Gram Steganography?
Traditional steganography conceals data in image pixels, audio waveforms, or whitespace formatting. However, when communicating across text-only messaging channels, email, or social media platforms, non-text files are often heavily re-encoded, stripped, or flagged by security scanners.
ngram-cipher solves this by transforming ciphertext directly into realistic natural language text:
- AES-256-GCM Authenticated Encryption: Strong symmetric security with PBKDF2 key derivation (100,000 SHA-256 iterations).
- Statistical Language Models: Uses dynamic N-gram statistical scoring from Google Books datasets to ensure word continuations follow natural syntactic and semantic distributions.
- Grammar & Variety Rules: Generates varied sentence structures with appositives, clauses, and reporting verbs, while actively preventing structural repetition across consecutive sentences.
- 100% Exact Recovery: Employs power-of-two slot allocation and CRC32 verification to ensure bit-exact decryption every time.
Interactive Browser Demo
You can try the cipher directly in your browser on our new documentation page:
👉 Try the N-Gram Cipher Interactive Demo
import { encode, decode } from "ngram-cipher";
// Encrypt & hide in news prose
const carrierText = await encode("Top secret deployment instructions", "ArkPassword123");
console.log(carrierText);
/*
"A regional leader approved the measure. The executive announced the directive in Paris;
Local investment remained 14.5% in Madrid..."
*/
// Reversibly extract & decrypt
const decrypted = await decode(carrierText, "ArkPassword123");
console.log(decrypted); // "Top secret deployment instructions"
Check out the code and documentation on GitHub.