Short Answer 
Matt should first encrypt the document to protect sensitive data, then send it via a digitally signed Government email to ensure security and integrity. Lastly, he must ensure compliance with government regulations to avoid legal issues and adhere to security standards.
Step 1: Encrypt the Document
Matt should first encrypt the document that contains the source selection data. This process ensures that the information is protected and only the intended recipient, in this case, his supervisor, can access it. Encryption helps in safeguarding sensitive data from unauthorized users and provides a secure layer of protection that is essential for handling classified information.
Step 2: Use Digitally Signed Government E-mail
Next, Matt should send the encrypted document via a digitally signed Government e-mail. Utilizing a government-approved email system adds a layer of security while confirming the identity of the sender. The digital signature also guarantees that the document has not been altered during transmission, maintaining the integrity of the information shared.
Step 3: Ensure Compliance with Regulations
Finally, it’s important for Matt to consider compliance with government regulations when sharing sensitive data. By using encrypted communication and verified government channels, he adheres to mandatory protocols for data protection. This step helps to avoid legal repercussions associated with improper handling of confidential information and ensures the process aligns with established security standards.