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SECURITY SCORE
Certificate Information
Subject
CN=tsurukame.app
Issuer
C=US, O=Google Trust Services, CN=WE1
Valid From
October 22, 2025
Valid Until
January 20, 2026
44 days
Public Key
ECDSA
256 bit
(P-256)
Adequate
Signature Algorithm
ECDSA-SHA256
SHA-256 Fingerprint
10:98:B5:D4:DE:3E:EB:F5:1A:99:78:00:54:A0:61:ED:EB:B9:D1:FE:08:A2:65:9B:CF:01:3E:AB:5D:12:48:E2
Alternative Names
Security Configuration
TLS Protocols
TLS 1.0
TLS 1.1
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
Warnings
- • TLS 1.1 is deprecated and should be disabled
- • TLS 1.0 is deprecated and should be disabled
HTTP Security Headers
Status
Strict-Transport-Security
Good
max-age=31536000; includeSubDomains
Content-Security-Policy
Good
upgrade-insecure-requests; default-src; img-src; +11 more
upgrade-insecure-requests; default-src 'none'; img-src 'self' https://*.apple.com https://*.mzstatic.com data:; font-src 'self' https://*.apple.com; style-src 'self' https://*.apple.com 'unsafe-inline'; script-src 'self' https://*.apple.com 'sha256-MS6/3FCg4WjP9gwgaBGwLpRCY6fZBgwmhVCdrPrNf3E=' 'sha256-tQjf8gvb2ROOMapIxFvFAYBeUJ0v1HCbOcSmDNXGtDo=' 'sha256-p7PoC97FO+Lu90RNjGWxhbm13yALSR4xzV8vaDhaQBo=' 'sha256-+5XkZFazzJo8n0iOP4ti/cLCMUudTf//Mzkb7xNPXIc='; connect-src 'self' https://*.apple.com https://*.mzstatic.com; media-src 'self' https://*.apple.com blob:; child-src 'self' https://*.apple.com; frame-src 'self' https://*.apple.com itms-appss: macappstore:; worker-src blob:; frame-ancestors 'none'; block-all-mixed-content; report-uri /api/csp-report
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
- • Consider adding 'preload' to HSTS for maximum security
- • 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