Nokia University of Applied Sciences Bonn-Rhein-Sieg Nokia Transmute Self-Issued Consulting This specification defines Hybrid Public Key Encryption (HPKE) for use with JSON Object Signing and Encryption (JOSE). HPKE offers a variant of public key encryption of arbitrary-sized plaintexts for a recipient public key. HPKE works for any combination of an asymmetric key encapsulation mechanism (KEM), key derivation function (KDF), and authenticated encryption with additional data (AEAD) function. This document defines the use of the HPKE with JOSE.