Question

If David wishes to digitally sign the message that he is sending Mike, what key would he use to create the digital signature

Answer 1

The key would he use to create the digital signature is Mike public key.

Which key is used to sign messages?

Digital signatures are known to be used via public key. Here, the person is said to be one who is said to produce or creates the digital signature that  uses a private key to encrypt signature-linked data.

The only way to decrypt a data is only with the signer's public key, the key David would use to create the digital signature is Mike public key.

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