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81/100 SECURITY SCORE

Certificate Information

Subject
CN=ferguson.matse.illinois.edu
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
November 25, 2025
Valid Until
February 23, 2026 87 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
7C:16:0E:E8:CA:77:9A:0B:13:8B:D4:5C:73:ED:05:21:FE:AD:80:F1:DE:68:CF:2A:71:3C:40:E0:75:18:18:AF
Alternative Names
29 domains

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

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