In the course's public-key file-encryption activity, which key is used to encrypt a file for its owner?
Answer
The owner's public key
Explanation
### Why this is right
The activity encrypts the file with the public key. The owner uses the corresponding private key to decrypt it.
### The concept
This is the asymmetric confidentiality workflow. The public key can be shared with people who need to send protected data to its owner, while the private key remains protected. A hash is not a decryption key, and signing with a private key has a different purpose.
### The other options
- **B. The owner's private key**: the owner uses this key to decrypt data encrypted with the matching public key.
- **C. The sender's private key**: a sender's private key may be used for signing, not this recipient confidentiality operation.
- **D. A hash of the file**: a hash helps check integrity and cannot encrypt the file.
### Remember
Encrypt to the key owner with the owner's public key.
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