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Which of the following would effectively verify the originator of a transaction?

Using a secret password between the originator and the receiver

Encrypting the transaction with the receiver’s public key

Using a portable document format (PDF) to encapsulate transaction content

Digitally signing the transaction with the source’s private key

A digital signature is an electronic identification of a person, created by using a public key algorithm,
to verify to a recipient the identity of the source of a transaction and the integrity of its content.
Since they are a ‘shared secret’ between the user and the system itself, passwords are considered
a weaker means of authentication. Encrypting the transaction with the recipient’s public key will
provide confidentiality for the information, while using a portable document format(PDF) will probe
the integrity of the content but not necessarily authorship.

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