This case study examines a cyber security breach at ABCXYZ Bank, where hackers stole confidential client data and proprietary documents, publishing some to damage the bank's reputation. The report focuses on the legal and regulatory responsibilities of the bank, including the application of cyber security measures like cryptography and firewalls to protect sensitive information. It explores the roles of different types of hackers, the importance of data protection, and the relevant legislation such as the Communication Act 2003 and the Data Protection Act 1998. The case study highlights the ethical and professional responsibilities of the bank's management, particularly in their response to the breach, and the impact of such incidents on financial firms, referencing examples like the JP Morgan Chase cyber-attack. The conclusion emphasizes the importance of implementing robust cyber security measures to safeguard confidential data and maintain customer trust.