In the digital-signature workflow described in the course, which key does the signer use to sign?
Answer
The signer's private key
Explanation
### Why this is right
The signer uses their private key to create the signature. A recipient checks it using the corresponding public key.
### The concept
A digital signature supports evidence of authenticity and integrity. It differs from confidentiality encryption: signing does not conceal the document. In a confidentiality example, a sender encrypts for a recipient with the recipient's public key, which is a different key operation and purpose.
### The other options
- **B. The recipient's private key**: the recipient's private key is used to decrypt data sent confidentially to that recipient.
- **C. The signer's public key**: recipients use the public key to verify, not to create the signature.
- **D. A public key belonging to a certificate authority**: a CA may sign certificates, but it does not sign every sender's document.
### Remember
The signer signs with a private key; recipients verify with its matching public key.
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