Summary

In this chapter, we learned about the concept of asymmetric cryptography. Then, we learned about the concept of an MITM attack and also how to mitigate that attack. After that, we learned what a session key is. We finished the theoretical part by learning about RSA security, the trade-off between security and performance, and what RSA key size to choose.

In the practical part, we learned how to encrypt and decrypt with RSA on the command line. Then, we learned how to encrypt and decrypt with RSA programmatically in C code. We also learned about the OpenSSL error queue and how to check it for errors.

In the next chapter, we will continue learning about asymmetric cryptography. Particularly, we will learn about digital signatures and their verification.