This essay delves into the critical domain of information security, focusing on the pervasive threat of insider attacks and the application of the Diffie-Hellman key exchange technique. The essay begins by defining insider threats as malicious activities originating from individuals within an organization, including employees and business associates, and highlights their significant role in cybercrimes and data breaches. It explores the motivations behind such attacks, primarily financial gain, and discusses various types of insider threats. The second part of the essay examines the Diffie-Hellman key exchange, a crucial technique for securing communication channels by enabling secure data exchange through cryptography. The essay explains how Diffie-Hellman works, its advantages, and its role in protecting data. It concludes by emphasizing the importance of implementing robust security measures, including employee training, security incident policies, regular audits, and two-factor authentication to mitigate insider threats and protect sensitive data. The essay underscores the need for continuous vigilance and adaptation in the face of evolving cyber threats, providing a comprehensive overview of insider threats and the Diffie-Hellman key exchange.