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CISO: The Jedi Master of Cybersecurity. Take Off Strong in Your First 100 Days! Detailed Strategic and Tactical Plan.

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My personal recommendations on the relevant topics to be addressed, taking a comprehensive approach during the first 100 days of a CISO in office in a new company, framing these topics within a Strategic and tactical planning.


The CISO’s first 100 days in office represent a critical window for establishing a solid foundation for information security in the organization. This comprehensive plan provides a detailed roadmap to understand your environment, build key relationships, and achieve tangible results that drive long-term security.

The addition of a new Chief Information Security Officer (CISO) represents a crucial opportunity to strengthen an organization’s information security posture. This detailed plan provides strategic and tactical guidance for the CISO’s first 100 days, focused on establishing a solid foundation, understanding the current environment, and achieving tangible results that drive long-term security.

Strategic Objectives:

  1. Establish strong, long-lasting relationships: Build trust and collaboration with key stakeholders, including senior management, IT leaders, security teams, auditors (internal and external), legal and compliance departments, and other relevant areas. Implement effective communication channels to ensure a transparent and two-way flow of information.
  2. Comprehensive current state assessment: Conduct a comprehensive analysis of the risk landscape, including internal and external threats, technical and human vulnerabilities, and third-party risks. Assess security maturity by reviewing policies, procedures, network architecture, incident reports, risk assessments, and business continuity plans. Identify regulatory compliance gaps and priority areas of improvement.
  3. Define a clear, ambitious and aligned vision: Develop a long-term strategic information security plan that aligns with the strategic objectives of the business, considering emerging trends in cybersecurity and best practices in the sector. Set SMART (Specific, Measurable, Achievable, Relevant, Time-bound) goals and define key metrics to measure program success.
  4. Achieve tangible quickwins: Identify and implement high-impact, low-effort projects that can generate visible and measurable results in the short term. These projects may include patch management improvements, strengthening authentication, implementing security awareness programs, or reviewing critical policies. Communicate achievements effectively to build trust and gain stakeholder support.

Detailed Tactical Plan (First 100 Days):

Phase 1 (Weeks 1-4): Assessment and Relationship Building

  • Individual meetings: Establish contact with key stakeholders to understand their security needs, concerns and expectations.
  • Information Gathering: Conduct a thorough inventory of information assets, review relevant documentation, and conduct interviews with key personnel to obtain a complete view of the current state of security.
  • Risk Assessment: Perform a scenario-based risk analysis to identify the most critical risks to the business and evaluate the effectiveness of existing controls.
  • Establishment of communication channels: Implement formal and informal communication channels to guarantee a transparent and two-way flow of information with all stakeholders.

Phase 2 (Weeks 5-8): Security Plan Development and Initiative Prioritization

  • Security Plan Development: Develop a detailed strategic plan that includes a description of the vision, objectives, strategies, tactics, necessary resources, and an implementation schedule.
  • Initiative Prioritization: Use a risk prioritization matrix to rank initiatives based on their impact and likelihood of occurrence.
  • Resource Allocation: Develop a detailed budget for the security program and obtain approval from senior management.
  • Plan Presentation: Present the strategic security plan to senior management, highlighting key risks, benefits and expected return on investment.

Phase 3 (Weeks 9-12): Implementing Quick Wins and Team Strengthening

  • Implementing Quick Wins: Execute priority projects with a focus on tangible, measurable results.
  • Strengthening the security team: Evaluate the team’s skills and competencies, identify gaps and develop a training and professional development plan.
  • Review and update policies and procedures: Ensure policies and procedures are up to date, aligned with best practices and legal requirements.
  • Establishing KPIs: Define key performance indicators to measure the progress and success of the security program.

Phase 4 (Weeks 13-16): Assessment, Long-Term Planning, and Maintaining Momentum

  • Progress Assessment: Conduct a thorough review of the results of implemented initiatives and adjust the security plan as necessary.
  • Long-term planning: Develop a long-term security strategy spanning the next 3-5 years.
  • Maintaining momentum: Continue communicating achievements, seeking new opportunities for improvement, and maintaining stakeholder engagement.

This detailed plan provides a complete guide for a CISO’s first 100 days.

By following this plan, the CISO can establish a solid foundation for an effective, long-lasting security program that protects the company’s information assets and contributes to business success.

To be continue…..

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