For confidentiality, which key does a sender use to encrypt data for a recipient in the public-key workflow described in the course?
Answer
The recipient's public key
Explanation
### Why this is right
The sender encrypts for the recipient using the recipient's public key. The recipient's matching private key performs the corresponding decryption.
### The concept
The public key can be distributed, while the private key remains with its owner. This workflow aims at confidentiality because the matching private key is needed to decrypt. It differs from signing, where a sender uses a private key to create a signature that others can verify with the public key.
### The other options
- **B. The sender's public key**: it is not the recipient's matching key for the described confidentiality workflow.
- **C. The recipient's private key**: this key is retained by the recipient and used to decrypt.
- **D. A secret key shared by every user**: symmetric encryption uses a shared secret, not a public-private key pair.
### Remember
Encrypt to a recipient with that recipient's public key.
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