Final answer:
One solution for Mike to send secure and encrypted email to Deborah is to use end-to-end encryption, such as ProtonMail. For sharing confidential documents, Mike can use a file encryption tool like VeraCrypt.
Step-by-step explanation:
One solution for Mike to send secure and encrypted email to Deborah and share confidential documents with her is to use end-to-end encryption. This means that the message is encrypted on Mike's device and can only be decrypted by Deborah's device, ensuring that only she can access the content.
A popular example of an end-to-end encrypted email service is ProtonMail. ProtonMail uses strong encryption algorithms to protect the content of the emails, making it nearly impossible for unauthorized users to access the information. Mike and Deborah can both create ProtonMail accounts and exchange their email addresses to communicate securely.
Additionally, for sharing confidential documents, Mike can use a file encryption tool such as VeraCrypt. VeraCrypt allows Mike to create encrypted containers or encrypt specific files, providing an extra layer of security to the shared documents.