Open
Cached
·
just now
92/100
SECURITY SCORE
Certificate Information
Subject
CN=concept-decks.com
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
December 01, 2025
Valid Until
March 01, 2026
41 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
B8:F1:C4:30:CF:30:EE:CB:28:56:93:2D:0C:B1:5B:26:B5:06:81:2B:2B:FF:A2:D8:58:29:B3:96:4A:0B:5F:4A
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
Excellent
max-age=63072000; includeSubDomains; preload
Content-Security-Policy
Basic
default-src; img-src; media-src; +3 more
default-src * blob: data: cid:; img-src * data: blob: cid: 'unsafe-inline'; media-src * data: blob:; script-src * data: blob: 'unsafe-inline' 'unsafe-eval'; style-src * blob: data: 'unsafe-inline'; style-src-elem * blob: data: 'unsafe-inline', font-src * data:
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer-when-downgrade
Permissions-Policy
Missing
Not configured
Recommendations
- • Improve CSP by adding more specific directives and removing 'unsafe-inline'
- • 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