Cybersecurity advisory | Risk and assurance
Connect business impact, control evidence and risk ownership.
Defensive Security helps Australian organisations assess
cybersecurity exposure, evaluate safeguards and prioritise
practical treatment decisions.
From exposure to accountable action
ILLUSTRATIVE MODEL
Business objectives, critical services, information
classification, risk appetite and decision authority.
Identify the threat event, exposed assets, vulnerabilities
and conditions that could affect a business service.
Assess likelihood and business impact using agreed criteria,
existing controls, evidence and explicit uncertainty.
Compare assessed risk with appetite and tolerance.
Consider treatment options, dependencies and expected
residual risk.
Assign control and risk owners. Record approval, actions,
review dates and evidence needed to reassess exposure.
Continuous review:
changes, incidents and new control evidence feed back into
the scenario and assessment.
When clarity matters
Whether you are reviewing a critical service, preparing for
assurance, assessing a major change or prioritising investment,
an assessment should explain what could go wrong, why it matters
and what evidence supports the conclusion.
We agree the assessment boundary, criteria and evidence
requirements before work begins. Missing evidence and uncertainty
are recorded explicitly, rather than presented as confidence
in a control.
Our services
Select the activities that support your decision, with scope
and deliverables agreed for each engagement.
Build risk scenarios around business services, information
and technology dependencies.
Typical output
Scenario-based risk register with assessment rationale.
Evaluate control design, implementation and operation
against agreed criteria.
Typical output
Control findings and an evidence register.
Connect cybersecurity decisions to enterprise risk management.
Typical output
Governance recommendations and decision-ready reporting.
Turn findings into prioritised actions with accountable owners.
Typical output
Prioritised treatment plan and reassessment triggers.
Assessment discipline
Define scope, information sensitivity, critical dependencies,
rating criteria and how existing controls are considered.
Distinguish assessed current risk from a forecast after
proposed treatment.
Record evidence sources, dates, sampling, test coverage
and limitations. A documented control does not by itself
demonstrate effective operation.
Decision ownership:
your authorised decision-makers approve treatment or acceptance.
Control owners implement and maintain safeguards. Residual risk
remains with the organisation and is reviewed when circumstances
or evidence change.
What you receive
Scenarios, affected services, likelihood and impact rationale,
control dependencies and risk owners.
Assessment criteria, supporting evidence, gaps, test
limitations and control-owner actions.
Priorities, accountable owners, dependencies, milestones
and expected risk reduction to validate.
Material exposures, decisions required, acceptance authority
and triggers for further review.
Framework-informed, context-led
Framework selection follows the organisation’s objectives,
jurisdiction and agreed assessment scope. A framework
reference is not a claim of compliance or certification.
The National Institute of Standards and Technology (NIST)
Cybersecurity Framework (CSF) provides outcomes across Govern,
Identify, Protect, Detect, Respond and Recover. These functions
are complementary, not a sequential risk-assessment process.
Current and Target Profiles can support prioritisation
and communication.
NIST Special Publication 800-30 Revision 1 provides
risk-assessment guidance. The separate NIST Risk Management
Framework (RMF) integrates risk management into the system
life cycle. We agree which guidance is useful; the engagement
model above does not claim to reproduce the RMF.
The Australian Signals Directorate (ASD) Information Security
Manual (ISM) supports risk-based protection of information
technology and operational technology systems. Essential Eight
mitigation guidance can inform relevant control reviews.
Applicable requirements and assessment coverage must be
established for the environment.
The Protective Security Policy Framework (PSPF) and NSW Cyber
Security Policy have different jurisdictional scopes. We
establish applicable entity, information-classification,
governance and assurance requirements before using them
as assessment criteria.
Additional references: NIST RMF, PSPF and Essential Eight.
Australian operating context
For enterprises, government agencies and critical infrastructure
operators, we consider service dependencies, information
classification, personal information handling, third parties
and operational constraints. Applicable legal, policy and
contractual obligations are confirmed individually, including
critical infrastructure obligations where relevant.
Assurance conclusions are limited to the agreed criteria,
evidence and testing period. Advisory assessments do not
establish regulatory compliance, government endorsement or
accredited certification. Unverified controls, excluded systems
and evidence gaps remain visible in the findings.
Start with your priorities
Discuss the service, system or assurance question you need
to address. We can then define a proportionate assessment
scope, evidence requirements and useful deliverables.
Discuss cybersecurity architecture, cloud security, risk management and governance priorities with Defensive Security. We help Australian organisations identify practical next steps.
Tell us what you would like to discuss. We will confirm the proposed discussion and availability when we respond.
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