Which department maintain's contacts with law enforcement authorities, regulatory bodies, information service providers and telecommunications service providers depending on the service required.

The Chief Information Security Officer (CISO) is the senior-level executive responsible for an organization's information and data security. A key part of this role involves establishing and maintaining relationships with external entities. This includes liaising with law enforcement agencies for investigating cybercrimes, communicating with regulatory bodies to ensure compliance and manage breach notifications, and coordinating with service providers to manage security services and respond to incidents. This responsibility is a core component of information security governance and incident management frameworks.

A. COO: The Chief Operating Officer oversees general business operations; specific information security liaison duties are typically delegated to the CISO.
C. CSM: This acronym is ambiguous (e.g., Customer Success Manager), but common interpretations are unrelated to information security governance or liaison with law enforcement.
D. MRO: Maintenance, Repair, and Operations is a function focused on physical asset and facility management, not information security or regulatory contact.

1. ISO/IEC 27002:2022 - Information security, cybersecurity and privacy protection — Information security controls.

Control 5.5 (Contact with authorities): This control states, "The organization should establish and maintain contact with relevant authorities." The implementation guidance specifies that this contact is managed by assigned personnel, which in practice is the information security function led by the CISO.

Control 5.26 (Management of information security incidents and improvements): This control implies communication with external parties, including law enforcement, during an incident, a process managed by the CISO's team.

2. Carnegie Mellon University, Heinz College of Information Systems and Public Policy, "Chief Information Security Officer (CISO) Certificate Program."

The program curriculum outlines the CISO's role, stating they must "Communicate with a wide range of stakeholders... and with external parties, such as law enforcement and regulators." This directly supports the CISO's responsibility for maintaining these contacts.

3. Kissel, R. (Ed.). (2013). Glossary of Key Information Security Terms (NISTIR 7298 Rev. 2). National Institute of Standards and Technology.

Page 36, Definition of Chief Information Security Officer (CISO): While a glossary, it defines the CISO as the "senior official...responsible for...the development and maintenance of an information security program." This program inherently includes external communications and compliance activities as part of its scope.