As a system administrator at your company's help desk, the head of the department has tasked you with training two remote employees to ensure the authenticity and integrity of their messages. Given their frequent use of public Wi$-$Fi$,$ their Internet traffic is potentially vulnerable to modifications by malicious actors. As part of the training, you instruct them to send a message that applies digital signature techniques, which allows you to check for other potential security issues.

Requirements and considerations:

Since the aim is to validate the sender$\text{'}$s identity and message integrity, the selected cryptographic solution must offer both authenticity and integrity.

The solution should be efficient enough to be practical for everyday communications while maintaining a high level of security.

The remote employees must comply with all relevant data protection regulations and the company's privacy policies.