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?

  • isoOPAEnglish
    1·
    1 year ago

    I don’t want to use RSA too but nothing better comes to my mind :)

    • 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 🙏🫡