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CA Owner · Taiwan (Republic of China)

Taiwan-CA Inc. (TWCA)

Documentation

Document Repository: https://www.twca.com.tw/repository?lang=en
Policy Documentation: 1. TWCA CP applies to all Non-TLS Hierarchies. 2. TWCA Global CA CPS (for Non-TLS Hierarchy) applies to TWCA Global Root CA G2 (Non-TLS Hierarchy), TWCA Global Root CA, TWCA Root Certification Authority (old multipurpose roots) and non-TLS subordinate CAs. 3. TWCA CYBER CA CP/CPS (for TLS-only Hierarchy) applies to TWCA CYBER Root CA (TLS-only Hierarchy), TWCA Global Root CA, TWCA Root Certification Authority (old multipurpose roots) and TLS subordinate CAs.

Problem Reporting

ca[at]twca[dot]com[dot]tw

Mozilla CA Program — Known Bugzilla Cases (17)

#2045210 UNCONFIRMED 2026-06-05

Documents for TWCA

#2017381 ASSIGNED 2026-02-17

TWCA: Transition Plan for Existing Dual-Purpose Roots

#2004521 RESOLVED 2025-12-06

TWCA: CA Certificate not published in DER Encoded Format

#1952639 RESOLVED 2025-03-08

TWCA: Missing or Inconsistent Disclosure of S/MIME BR Audits

#1886110 RESOLVED 2024-03-19

TWCA: Revocation delay for TLS certificates with non-critical basicConstraints

#1885132 RESOLVED 2024-03-13

TWCA: TLS certificates with non-critical basicConstraints

#1884568 RESOLVED 2024-03-10

TWCA: Revocation delay for EV TLS certificates with invalid subject attribute order

#1883620 RESOLVED 2024-03-05

TWCA: TLS EV certificates with invalid subject attribute order

#1849702 RESOLVED 2023-08-22

Add Taiwan-CA Inc. (TWCA) root certificates

#1848306 RESOLVED 2023-08-11

TWCA: CA certificate without EKU

#1848240 RESOLVED 2023-08-10

TWCA: Undisclosed CA

#1793445 RESOLVED 2022-10-03

TWCA: "unknown" OCSP response for issued certificates

#1738778 RESOLVED 2021-11-01

TWCA: Policy OID not set to indicate the assurance level to the issued certs

#1716670 RESOLVED 2021-06-15

TWCA: Intermediate CA Certificate Missing from Audit Reports

#810133 RESOLVED 2012-11-09

Add one more Root Certificate of TWCA in Mozilla software

#745671 RESOLVED 2012-04-16

Enable EV and Turn on Code Signing trust bit for TWCA Root certificate

#518503 RESOLVED 2009-09-24

Add TWCA Root Certificate

Certificates (31)

TWCA CYBER Root CA

Root M: Included C: Included A: Not Included M: Included 2022-11-22 – 2047-11-22

TWCA Global Root CA

Root M: Included C: Included A: Included M: Included 2012-06-27 – 2030-12-31

TWCA Global Root CA G2

Root M: Included C: Not Included A: Not Included M: Included 2022-11-22 – 2047-11-22

TWCA Root Certification Authority

Root M: Not Yet Included C: Not Included A: Not Included M: Disabled 2008-08-28 – 2030-12-31

TWCA Root Certification Authority

Root M: Included C: Removed A: Included M: Included 2008-08-28 – 2030-12-31

TaiCA Information Policy CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2010-10-25 – 2018-10-25

TaiCA Information User CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2010-10-14 – 2018-10-14

TaiCA Secure CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2010-06-08 – 2020-06-08

TWCA CYBER Root CA

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2022-12-09 – 2030-12-09

TWCA EVSSL Certification Authority

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2011-06-10 – 2021-06-10

TWCA EVSSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2024-09-06 – 2034-09-06

TWCA EVSSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2023-02-23 – 2033-02-23

TWCA Global EVSSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2012-08-23 – 2030-08-23

TWCA Global Root CA

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2014-10-28 – 2030-10-28

TWCA Global Root CA G2

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2022-12-09 – 2030-12-09

TWCA InfoSec User CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2012-06-08 – 2022-06-08

TWCA InfoSec User CA

Intermediate M: Trusted C: Not Trusted A: Trusted M: Trusted 2018-10-12 – 2028-10-12

TWCA InfoSec User CA

Intermediate M: Trusted C: Not Trusted A: Trusted M: Trusted 2024-03-15 – 2030-03-15

TWCA InfoSec User CA

Intermediate M: Trusted C: Not Trusted A: Trusted M: Trusted 2023-02-23 – 2033-02-23

TWCA InfoSec User CA

Intermediate M: Trusted C: Not Trusted A: Trusted M: Trusted 2018-10-12 – 2028-10-12

TWCA InfoSec User CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2010-11-16 – 2018-11-16

TWCA InfoSec User CA

Intermediate M: Trusted C: Not Trusted A: Trusted M: Trusted 2024-09-06 – 2034-09-06

TWCA InfoSec User CA

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2014-10-28 – 2024-10-28

TWCA Secure SSL Certification Authority

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2023-04-13 – 2030-04-13

TWCA Secure SSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2023-08-18 – 2030-08-18

TWCA Secure SSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2023-10-16 – 2030-10-16

TWCA Secure SSL Certification Authority

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2014-10-28 – 2024-10-28

TWCA SSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2023-02-23 – 2033-02-23

TWCA SSL Certification Authority

Intermediate M: Trusted C: Trusted A: Trusted M: Trusted 2024-09-06 – 2034-09-06

TWCA Timestamping Certification Authority

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2023-02-23 – 2033-02-23

TWCA Timestamping Certification Authority

Intermediate M: Not Trusted C: Not Trusted A: Not Trusted M: Not Trusted 2022-03-30 – 2030-03-31