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Security report for dataintensive.net

Martin Kleppmann · Technology · N/a

Medium risk. 8 critical or high findings in Security headers, GDPR outside view and 1 other check.

Security score

60/100

Risk levelMedium

0–100, higher is better. How it is calculated

The website dataintensive.net is dedicated to promoting the technical book 'Designing Data-Intensive Applications' by Martin Kleppmann. It serves a niche audience of software engineers and technical professionals interested in distributed systems, data scalability, and reliability. The site provides detailed information about the book, author background, testimonials from industry leaders, and purchasing options. The business model centers on book sales and educational content dissemination, positioning itself as a trusted resource in the technology education sector. Technically, the website is built using standard web technologies including HTML5, Bootstrap 3.2.0, and jQuery 1.11.1, hosted via Cloudflare. The site is mobile responsive and well-structured, though it lacks advanced SEO and accessibility features. No CMS or analytics frameworks are detected, indicating a lightweight and straightforward implementation. The site uses HTTPS but lacks DNSSEC and security headers, which could be improved to enhance security posture. From a security perspective, the site demonstrates basic good practices such as HTTPS usage and stable domain registration without privacy protection. However, it lacks formal privacy, cookie, or security policies, and no incident response or vulnerability disclosure mechanisms are present. No forms or data collection points are found, reducing exposure to input-based vulnerabilities. The overall security score is moderate, with recommendations to implement security headers, privacy policies, and DNSSEC. Overall, the website is professional, trustworthy, and content-rich for its target audience. The absence of privacy and cookie policies and limited security headers are notable gaps. The risk level is low given the nature of the site and lack of sensitive data processing, but improvements in compliance and security best practices are advised to maintain trust and regulatory alignment.

Scanned

NIS2 and GDPR posture

GDPR outside view
35/ 100 · High
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

8 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • High

      No Privacy Policy found

      GDPR requires a clear and accessible privacy policy

      What to do: Add a comprehensive privacy policy page and link to it prominently

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

Need hands-on remediation? Email guard@offseq.com

Keep watching dataintensive.net

This scan found 24 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Full report

€39.90one-time

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
65
Security headers
15
Email security
70
DNS health
75
Network security
100
GDPR outside view
35
Average
60

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

The website operates in the technology education sector, focusing on a specialized technical book authored by Martin Kleppmann. It holds a niche market position with strong endorsements from recognized industry figures, enhancing credibility. The business model is straightforward, relying on book sales and educational outreach. The target customers are software engineers and developers seeking deep understanding of data-intensive systems. The site does not appear to engage in extensive partnerships or affiliate marketing. Growth indicators include ongoing blog updates and multiple language translations. The partnership ecosystem is limited but includes reputable technology companies referenced in testimonials. The operation is small-scale and content-focused, with no evident revenue diversification beyond book sales.

Security posture

The security maturity of the website is basic to moderate. HTTPS is enforced, ensuring encrypted communications. The domain registration is transparent and consistent with the website's purpose. However, the absence of DNSSEC and security headers such as Content-Security-Policy and Strict-Transport-Security reduces defense-in-depth. No privacy or cookie policies are present, which may impact GDPR compliance. There is no visible incident response or vulnerability disclosure information, limiting transparency in security management. The lack of forms reduces attack surface, but also limits user engagement. Overall, the site is low risk but would benefit from enhanced security controls and compliance documentation to improve its security posture and user trust.

Recommendations

  1. Enable DNSSEC on the domain to protect against DNS spoofing and improve domain security.
  2. Implement standard security headers including Content-Security-Policy, X-Content-Type-Options, and Strict-Transport-Security to harden the website against common attacks.
  3. Publish comprehensive privacy and cookie policies to improve transparency and GDPR compliance.
  4. Add a security.txt file and vulnerability disclosure policy to facilitate responsible security reporting.
  5. Enhance accessibility features to meet modern standards and improve user experience for all visitors.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Martin Kleppmann
Description
The website promotes the book 'Designing Data-Intensive Applications' by Martin Kleppmann, focusing on educating software engineers about reliable, scalable, and maintainable data systems. It provides information about the book, author, testimonials, and purchasing options.
Key services
Book sales, Educational content, Author blog updates
Content quality
excellent
Branding
consistent

Technology

Stack
HTML5, Bootstrap 3.2.0, jQuery 1.11.1
Frameworks
Bootstrap
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
70/100
Good practices seen
  • HTTPS enabled

Analytics and tracking

Tracking level
minimal
Privacy practices
poor

Advertising

Transparency
poor

Site quality

Design
good
User experience
good
Content relevance
excellent
Navigation
good
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is focused on a single technical book and its author.
  2. No privacy, cookie, or terms of service policies found.
  3. No contact emails or phone numbers explicitly provided.
  4. No forms present on the site for data collection.
  5. External links mostly point to reputable domains related to author, book, or endorsements.
  6. No analytics or tracking scripts detected beyond jQuery and Bootstrap.
  7. No security headers detected in provided data; DNSSEC not enabled.
  8. Site uses HTTPS and Cloudflare DNS hosting.
  9. Content is professionally presented with strong trust signals from testimonials.
Technical notes

Notes

The website uses a simple and stable technology stack with Bootstrap 3.2.0 and jQuery 1.11.1, which are somewhat dated but still functional. The site is hosted on Cloudflare infrastructure, providing reliable DNS and HTTPS termination. Performance is moderate, with mobile optimization implemented via Bootstrap's responsive design. No CMS or analytics platforms are detected, indicating minimal technical complexity and reduced privacy concerns. The HTML structure is valid and well-organized, but SEO and accessibility could be improved with additional meta tags and ARIA attributes. The lack of modern JavaScript frameworks or CMS reduces potential technical debt but limits dynamic content capabilities.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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