Answer:
The oldest malware vector was emails.
Explanation:
Websites were not widespread early on into the internet, however it was very easy to have a virus that uses an email contact list, where it can send itself to other email addresses and spread.
The key would he use to create the digital signature is Mike public key.
<h3>Which key is used to sign messages?</h3>
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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Answer it your own self everybody can't always give u the answers
