The correct answer is: A. Sign digitally
A
public key is a mathematical algorithm that is used to encrypt and decrypt data. It is used to sign digitally, which means that it can be used to verify the authenticity of a document or message.A public key is a pair of keys, a public key and a private key. The public key is used to encrypt data, and the private key is used to decrypt data. The public key is shared with everyone, while the private key is kept secret.
To sign digitally, you first need to create a public and private key pair. You can do this using a software program like OpenSSL. Once you have created your key pair, you can use the public key to encrypt a message. The recipient of the message can then use the private key to decrypt the message.
Digital signatures are used to verify the authenticity of a document or message. They are also used to ensure that the document or message has not been tampered with.
Here are the brief explanations of each option:
- B. Verify the sign. This is not the correct answer because a public key is used to sign digitally, not to verify the sign.
- C. Verify the documents. This is not the correct answer because a public key is used to sign digitally, not to verify documents.
- D. Make payment. This is not the correct answer because a public key is used to sign digitally, not to make payments.