JWA:JSON Web Algorithms,Algorithms and identifiers specification
JWE:JSON Web Encryption,Encryption specification
JWS:JSON Web Signature,Digital signature/HMAC specification
JWT:JSON Web Token
JWK:JSON Web Key,Public key specification
参考:
JSON Crypto Specs Draft -02: JWS, JWE, JWK, JWA and JSON Web Token (JWT) Draft -10