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SECURITY SCORE
Certificate Information
Subject
CN=tech-blog.re-arc-lab.jp
Issuer
C=US, O=Google Trust Services, CN=WR3
Valid From
December 21, 2025
Valid Until
March 21, 2026
85 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
0B:60:B1:29:F7:C7:5E:4B:52:75:E0:CB:89:A1:78:31:72:34:1E:D9:7A:F4:1C:F2:3C:D9:82:7F:AD:28:C4:C7
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=31556926
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Missing
Not configured
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Add Content-Security-Policy header to prevent XSS attacks
- • Add X-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
- • Add X-Content-Type-Options: nosniff
- • 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
Subject Alternative Names
100 domains
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links.app.smilekiosk.gr
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taaran.in
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valmennukset-test.test.terveystalo.com
theshopreal.com
theworkshop.co.uk
qr.twinbuild.dev
vnprogrammer.com
smarthome.wasdlabs.com
shadow.waw.pl
Other domains in certificate