In the described verification workflow, the recipient uses the corresponding _____ key to check a digital signature.
Answer
public
Explanation
### Why this is right
The recipient uses the public key that corresponds to the sender’s private signing key. The public key allows verification without sharing the sender’s private key.
### The concept
A key pair contains related public and private keys. In this workflow, the sender keeps the private key secret and uses it to sign. The recipient obtains the corresponding public key and checks the signature against the document. This division allows verification by others without giving them signing authority. It is distinct from a shared-key system, where both parties use the same secret key.
### Terms
- **Public key**: A shareable key used here to verify a signature.
- **Private key**: A secret key used here to create a signature.
- **Key pair**: Related public and private keys used in public-key cryptography.
### Remember
Verification uses the public key that matches the private signing key.
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