CREST Penetration Testing

Our CREST-certified penetration testing service delivers industry-leading assurance that your systems are tested by cyber security experts who meet the highest standards of technical capability, professionalism, and integrity. Whether you're testing web applications, infrastructure, cloud environments, or mobile platforms, we provide a thorough, standards-based security assessment aligned with your business objectives.

CREST (Council of Registered Ethical Security Testers) is an internationally recognised accreditation body that certifies organisations and individuals providing penetration testing, cyber incident response, and threat intelligence services. CREST certification ensures that our testers operate under strict codes of conduct and have demonstrated proven competence through rigorous exams and practical assessments.

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Our CREST Penetration Testing Service Includes:
  • Scoping & Planning: Detailed consultation to define testing goals, targets, and timelines.
  • Reconnaissance & Information Gathering: Passive and active techniques to map out attack surfaces.
  • Vulnerability Identification: Manual and automated methods to identify known and unknown security weaknesses.
  • Exploitation: Safe, controlled attempts to exploit identified vulnerabilities to understand potential real-world impact.
  • Post-Exploitation & Lateral Movement (if in scope): Demonstrate potential attacker movement and data access beyond the initial entry point.
  • Reporting: Clear, prioritised report with executive summary, technical details, and actionable remediation guidance.
  • Debrief & Support: Walkthrough of findings with technical and non-technical stakeholders, plus optional retesting after fixes.

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Key Benefits:
  • Certified testers with recognised CREST qualifications
  • Compliance support for frameworks such as ISO 27001, PCI DSS, and GDPR
  • Real-world attack simulation to uncover hidden risks
  • Assurance that your test provider follows strict legal and ethical guidelines

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Test Types Offered:

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Why Choose Us?

As a CREST-accredited organisation, we combine deep technical expertise with a proven methodology. Our engagements are tailored to your risk profile, ensuring that you get relevant, actionable insights that go beyond basic vulnerability scanning.

In this video we break down the 8 stages of a penetration test in plain English. You’ll get a clear, step-by-step overview of the process our security teams use to find vulnerabilities safely, from planning and recon, all the way to the final report.

See Cyber Security Podcasts | Aristi for more informative cyber security videos.

Security Testing

OT Penetration Testing

Industrial operations are increasingly interconnected, and with that connectivity comes risk. Traditional IT security alone is not enough to protect critical systems such as Industrial Control Systems (ICS), Supervisory Control and Data Acquisition (SCADA), and other OT environments from sophisticated cyber threats. Our OT Penetration Testing service is specifically designed to help organisations identify, understand, and mitigate security gaps in their operational networks, without disrupting essential processes.

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Security Testing

Web Application and API Testing

In today’s interconnected world, web applications and Application Programming interfaces (APIs) are frequent targets for cyber-attacks, making their security crucial to your organisation’s operations and customer trust. Our Web Application and API Testing service offers a comprehensive assessment of both your web applications and APIs to identify and mitigate vulnerabilities before they can be exploited.

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Security Testing

Vulnerability Assessments

Proactive security is essential to safeguarding your organisation’s digital assets. Our Security Vulnerability Assessment service helps you identify, prioritise, and address security gaps across your IT environment, minimising the risk of breaches and enhancing your overall security posture.

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Security Testing

Physical Security Assessments

Physical security is a critical component of any comprehensive security strategy. Our Physical Security Assessments evaluate the resilience of your facilities and infrastructure against real-world threats, helping you to identify and mitigate risks before they impact your business.

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Mobile Application Testing

Securing your mobile applications is critical to protecting your business, users, and reputation. Our Mobile Application Testing service provides comprehensive assessments to identify vulnerabilities within your mobile apps, ensuring robust security and compliance with industry standards.

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Security Testing

Configuration Reviews

Our Configuration Review service provides a comprehensive analysis of your organisation’s system and application configurations to identify potential security vulnerabilities and compliance gaps. Leveraging industry best practices and standards, our team of certified security professionals meticulously examine your IT infrastructure to ensure that your configurations align with security policies and reduce the risk of unauthorised access or data breaches.

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Security Testing

CHECK Penetration Testing

Our CHECK Penetration Testing service provides government-approved security testing designed to assess and strengthen the resilience of systems handling sensitive UK government data. Delivered by National Cyber Security Centre (NCSC) CHECK-accredited testers, this service meets stringent standards set by the NCSC and is required for many government and public sector projects.

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Security Testing

Cyber Essentials/Cyber Essentials Plus

Cyber Essentials is a UK government-backed scheme designed to help organisations of all sizes protect themselves against common internet-based cyber threats. Certification demonstrates that you have essential security measures in place, reducing your exposure to risks and reassuring your customers and partners.

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Security Testing

Red Team Assessments

Our Red Team exercise is a goal-based assessment where we attack just like a real-world adversary using real world techniques to gain access to an agreed target within your IT environment.

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Security Testing

Cloud Security Assessment

Our Cloud Security Assessment is designed to assess your cloud hosted services for security weakness including misconfigurations, that can be exploited by an attacker to gain access to your service.

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Security Testing

PSN/PSNP IT Health Check

PSN and PSNP compliance requires assurance that your organisation’s external systems are protected from unauthorised access or change, and they do not provide an unauthorised entry point into systems that consume PSN/PSNP services.

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Security Testing

Phishing Assessments

Phishing is a commonly used technique by cyber criminals and can involve emails, text messaging, phone calls or social media.

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