kruptein is a Node‑JS library that provides high‑level, standards‑compliant encryption and decryption of strings using modern algorithms (default AES‑256‑GCM) with secure key‑derivation options such as PBKDF2, scrypt or Argon2. It’s aimed at developers who need a simple, configurable way to encrypt confidential data in their applications while handling IVs, authentication tags, and optional ASN.1 encoding automatically.