Issued by TWCA Secure CA

About this certificate

This digital certificate with serial number 65:c8:3b:7f was issued on by TAIWAN-CA INC. .

This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.

Cerificate errors/warnings *beta

  • ERROR: Certificate contains no Authority Info Access Issuers
  • ERROR: Certificate doesn't contain any subjectAltName
  • ERROR: Certificate CN is not listed in subjectAltName

National Taiwan Normal University

Organization: National Taiwan Normal University
Organization unit: Center for Educational Research and Evaluation
State / Province: Taiwan
Locality: Taipei
Country: TW


Organization: TAIWAN-CA INC.
Organization unit: SSL Certification Service Provider
State / Province: Taiwan
Locality: Taipei
Country: TW

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 65:c8:3b:7f
Serial Number (int): 1707621247
Serial Number lenght: 31 bits, 4 octets

SubjectKeyId: 02:ef:4c:db:b9:bc:0e:9c:25:3d:26:99:89:66:1a:62:b4:e5:21:95
AuthorityKeyId: 0a:69:4d:3b:5c:3c:e7:1d:61:12:54:3e:cb:58:d9:58:d0:79:f9:74

Fingerprint (sha1): 98:f5:62:db:39:46:ba:af:43:31:25:cd:5e:1b:50:c9:66:56:81:c1
Fingerprint (sha256): 90:f3:4c:9b:01:cf:a9:6c:ee:90:f3:b1:e1:7e:9e:c4:80:af:33:f0:2e:b3:8d:db:0c:91:87:cb:da:f6:a1:8f

Revocation information

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DNS Names
Email Addresses
IP Addresses

Advanced Certificate Properties

Technical details about this certificate

Public Key Algorithm


Key Size


Signature Algorithm

SHA1 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication


7 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names