Look up "Announcing the Advanced Encryption Standard (AES)" online. You should read this document for the FIPS 197 standard. Give a quick summary of the steps used to create and implement this cryptosystem.

The article "Announcing the Advanced Encryption Standard (AES)" may be found on the web for further reading. Check out the FIPS 197 standard paper just to be sure. Explain in detail how this particular cryptosystem came to be developed and deployed.

Explain the difference between a secure cipher, a CPA-secure cipher, and a CCA-secure cipher. Under what conditions do we need i) CPA security? ii) CCA security?