I need to

  • encrypt JSON payload (not just sign)
  • not share private key
  • verify the payload is generated with the shared public key and RSA fitting all of these.

As I’ve only made auth with JWT so far, I’m not sure. If I use RSA, I guess I have to put the encrypted text in the body.

Do you think it can be used? Any other suggestions?

  • alex_02@infosec.pubEnglish
    2·
    1 year ago

    This might help: https://www.scottbrady91.com/jose/json-web-encryption

    Looks like it uses RSA so what I said above I think still applies.

    EDIT: It is called JWE or JSON Web Encryption for help with what keywords you should search. There are also other symmetric algos you can use with RSA like chacha20, but I think it is best to start with AES just because it has been used for years and is very well documented.

    • isoOPAEnglish
      1·
      1 year ago

      TIL that RSA allows maximum 245 character payload. But I guess that doesn’t apply to JWE. Thanks for the suggestion, I’m researching 🙏🫡