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Security report for nondeterministic.computer

Nondeterministic Computer · Technology · N/a

Medium risk. 4 critical or high findings in Email security and GDPR outside view.

Security score

63/100

Risk levelMedium

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

Nondeterministic Computer operates an independent Mastodon social network instance focused on privacy, decentralization, and ethical design. The platform offers users a no-ads, no corporate surveillance environment to participate in the fediverse. The website presents a clear description of its mission and services, targeting users interested in decentralized social media. Technically, the site runs Mastodon version 4.3.8 with a React-based frontend, uses HTTPS with script integrity checks, and supports WebSocket streaming. While the site lacks some advanced security headers and cookie consent mechanisms, it maintains a good security posture overall. The WHOIS data is privacy-protected, which is justified for this type of small independent social network. Overall, the site is trustworthy, professional, and aligns well with its stated privacy and decentralization goals.

Scanned

NIS2 and GDPR posture

GDPR outside view
53/ 100 · Medium
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

4 findings rated critical or high. Fix these first.

  1. Email security

    SPF, DKIM and DMARC stop others sending email that looks like it comes from your domain, a common route to phishing and invoice fraud.

    • Critical

      No email authentication configured

      Domain is vulnerable to email spoofing

      What to do: Implement SPF, DKIM, and DMARC immediately

    • High

      No SPF record found

      SPF helps prevent email spoofing

      What to do: Add SPF record: "v=spf1 include:_spf.yourmailprovider.com ~all"

  2. GDPR outside view

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

    • 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

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

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

Keep watching nondeterministic.computer

This scan found 20 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.

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

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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
95
Security headers
75
Email security
40
DNS health
75
Network security
40
GDPR outside view
53
Average
63

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 business operates in the technology sector as a small independent Mastodon server, serving a niche market of privacy-conscious social media users. Its business model is based on providing decentralized social networking services without ads or corporate tracking. The platform leverages open source Mastodon software, positioning itself as a privacy-respecting alternative in the fediverse ecosystem. The presence of an active admin account and transparent platform versioning indicates operational maturity. No direct revenue streams or partnerships are evident from the data, suggesting a community or volunteer-driven model. The website's clean design and consistent branding support its credibility and user trust.

Security posture

The website demonstrates a solid security posture with HTTPS enforced and use of script integrity attributes. However, it lacks several recommended security headers such as Content-Security-Policy and X-Frame-Options, which could enhance protection against common web attacks. No vulnerabilities or exposed sensitive data were detected in the HTML content. The absence of a published security policy or incident response contact limits transparency in security governance. Privacy compliance is partial, with a privacy policy present but no cookie consent mechanism or GDPR-specific disclosures. Overall, the security maturity is good for a small independent service but could be improved with additional headers and formal policies.

Recommendations

  1. Implement comprehensive security headers including Content-Security-Policy, X-Frame-Options, and X-Content-Type-Options.
  2. Add a cookie policy and consent mechanism to improve privacy compliance.
  3. Publish a security policy and incident response contact information to enhance transparency and trust.
  4. Consider adding terms of service to clarify user rights and responsibilities.
  5. Regularly review and update WHOIS information if possible to improve domain transparency.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Nondeterministic Computer
Description
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!
Key services
Mastodon social networking, User profile directory, Federated social media participation
Content quality
good
Branding
consistent

Technology

Stack
Mastodon 4.3.8, React.js, JavaScript, CSS, WebSockets
Frameworks
Mastodon, React
Platforms
Fediverse
Performance
moderate
Mobile
good
Accessibility
basic
SEO
basic

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • No exposed sensitive data in HTML
  • Use of integrity attributes on scripts and stylesheets

Analytics and tracking

Tracking level
minimal
Privacy practices
good

Advertising

Transparency
excellent

Site quality

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

Key observations

  1. Website is a Mastodon social network instance focused on privacy and decentralization.
  2. Content is accessible and not blocked by WAF or security challenges.
  3. No contact emails or phone numbers explicitly provided on the explore page.
  4. Privacy policy is present but cookie policy and terms of service are not found.
  5. No security.txt or vulnerability disclosure information found.
  6. Website uses HTTPS with good script integrity checks but lacks some security headers.
  7. No advertising or tracking services detected, aligning with privacy-focused claims.
Technical notes

Notes

The website uses a modern technology stack centered on Mastodon 4.3.8 and React.js for the frontend. It employs HTTPS with script integrity attributes for security. The site is mobile optimized with responsive design and basic accessibility features. Performance is moderate with no obvious loading issues. SEO is basic but includes relevant meta tags and Open Graph data for social sharing. No CMS is detected, consistent with a custom Mastodon deployment. Hosting provider details are not disclosed. The technical implementation is solid but could benefit from enhanced accessibility and SEO optimizations.
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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