The rapid advancement of artificial intelligence (AI) technologies, particularly OpenAI's ChatGPT, has significantly impacted higher education institutions (HEIs), offering opportunities and challenges. While these tools enhance personalized learning and content generation, they threaten academic integrity, especially in assessment environments. This study systematically examines the impact of ChatGPT on academic integrity in HEIs, focusing on exam design, assessment strategies, AI detection tools, and policy frameworks. This research draws from current literature and expert recommendations to identify practical approaches for developing assessments that foster critical thinking and deep cognitive engagement, making them less susceptible to AI-generated content. Key areas explored include the creation of complex, analytical exam formats, deploying advanced AI detection software to counter AI-assisted cheating, and formulating institutional policies that promote the ethical use of AI. This comprehensive framework aims to equip educators and administrators with practical strategies to preserve academic standards while harnessing the potential benefits of AI, ensuring the continued validity of assessments in the AI-driven educational landscape.