Your question is Encryption and Decryption Basics. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
What are Encryption and Decryption, and explain the Private key and public key concept?
Asked in the Technical stage. Explain the purpose of encryption and decryption, distinguish symmetric from asymmetric cryptography, and describe how public and private keys are used for confidentiality, authentication, and digital signatures.