Answer:
S/MIME
Explanation:
According to my research on information technology, I can say that based on the information provided within the question the security solution that provides this is called S/MIME. This term refers to the Secure/Multipurpose Internet Mail Extensions which is a security solution for public key encryption as well as security signing of Multipurpose Internet Mail Extensions (email information). Like mentioned in the question this provides provides integrity, sender authentication, and confidentiality for the information.
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