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SECURITY SCORE
Certificate Information
Subject
CN=do.de
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
November 22, 2025
Valid Until
February 20, 2026
37 days
Public Key
RSA
4096 bit
Strong
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
29:F3:D0:72:5D:DF:E3:6C:2D:FB:02:AA:68:89:31:2E:A7:95:53:26:2F:32:B7:F8:3D:50:82:95:4E:4B:3E:32
Alternative Names
Security Configuration
TLS Protocols
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
HTTP Security Headers
Status
Strict-Transport-Security
Present
max-age=31536000;
Content-Security-Policy
Good
default-src; manifest-src; script-src; +13 more
default-src 'none' ; manifest-src 'self' ;script-src 'self' 'nonce-6ab6bdf34d4672e924665505777c267d' 'report-sample'; style-src 'self' data: 'unsafe-inline' 'report-sample'; img-src * data:; font-src 'self' 'report-sample'; connect-src * ; media-src * ; object-src 'none' ; child-src * ; frame-src * ; worker-src 'self' blob: ; frame-ancestors 'self' ; form-action 'self' payment.multiapi.de *.paypal.com *.klarna.com; block-all-mixed-content; base-uri 'self' ;
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Strengthen CSP by removing 'unsafe-eval'
- • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
- • Consider adding Permissions-Policy to control browser features
CAA Records (Certificate Authority Authorization)
CAA Records
Not Configured
(Any CA can issue certificates)
CAA Issues
- • No CAA records configured - any CA can issue certificates
Recommendations
- • Implement CAA records to restrict which CAs can issue certificates for your domain
- • This adds an extra layer of security against unauthorized certificate issuance
- • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
- • Consider adding 'iodef' record to receive security incident reports