1. This simply generates keys for alice bob and ken.
2. encrypt a simple message bob to alice.
3. include bob's signature
4. to send a larger message use AES.  Generate a symmetric key using RSA keys
5. encrpyt using AES
6. alice decrypts
7. alice verifies it's from bob - which it should
8. alice verifies it's from ken - which isn't shouldn't.