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SECURITY SCORE
Certificate Information
Subject
CN=cdn.krystal.uk
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
December 16, 2025
Valid Until
March 16, 2026
88 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
BB:CD:95:35:2F:CA:FC:7B:37:5D:D4:E5:D7:22:38:9B:8A:90:11:3C:A5:4B:C9:A0:5C:4C:35:35:65:BD:2C:74
Alternative Names
Security Configuration
TLS Protocols
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
HTTP Security Headers
Status
Strict-Transport-Security
Present
max-age=16070400; includeSubDomains
Content-Security-Policy
Weak
frame-ancestors
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Present
accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=()
Recommendations
- • Increase HSTS max-age to at least 1 year and add includeSubDomains
- • Significantly strengthen CSP directives
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