# OISTE WISeKey Global Root GC CA root certificate (OISTE)

> OISTE WISeKey Global Root GC CA is a root CA certificate operated by OISTE (ECDSA P-384, valid until 2042-05-09, SHA-256 8560F91C). As of the latest CCADB data it is trusted for TLS server authentication by 4 of 4 major root stores: Chrome, Mozilla, Apple, Microsoft.

Source: https://ssl.sh/roots/oiste-wisekey-global-root-gc-ca/
Last updated: 2026-11-10

OISTE WISeKey Global Root GC CA is a root CA certificate operated by OISTE (ECDSA P-384, valid until 2042-05-09, SHA-256 8560F91C). As of the latest CCADB data it is trusted for TLS server authentication by 4 of 4 major root stores: Chrome, Mozilla, Apple, Microsoft.

| Field | Value |
|---|---|
| CA owner | OISTE |
| Subject | CN=OISTE WISeKey Global Root GC CA,OU=OISTE Foundation Endorsed,O=WISeKey,C=CH |
| SHA-256 | 8560F91C3624DABA9570B5FEA0DBE36FF11A8323BE9486854FB3F34A5571198D |
| SPKI SHA-256 | FD371BEA9755FF60C8828C849B8E5215DE532D61B009855FA0AD630D90EEF82E |
| Valid from | 2017-05-09 |
| Expires | 2042-05-09 |
| Key | ECDSA P-384 |
| Signature algorithm | ecdsa-with-SHA384 |
| Serial number | 212A560CAEDA0CAB4045BF2BA22D3AEA |
| SHA-1 (Windows thumbprint) | E011845E34DEBE8881B99CF61626D1961FC3B931 |

## Root store status

| Root store | Status | Trusted for TLS | Distrust for TLS after | Details |
|---|---|---|---|---|
| Chrome | Included | Yes | 2026-09-30 | - |
| Mozilla | Included | Yes | - | Trust bits: Websites; EV policy OIDs: not EV-enabled; First included in: NSS 3.39 / Firefox 63; Inclusion bug: #1403591 |
| Apple | Included | Yes | - | Trust bits: serverAuth, clientAuth, emailProtection |
| Microsoft | Included | Yes | - | Trusted EKUs: Server Authentication, Client Authentication, Code Signing, Document Signing, Encrypting File System, Secure Email, Time Stamping; Not-before cutoff: 2026-09-15 (Code Signing, Document Signing, Encrypting File System, Secure Email, Time Stamping) |

Chrome stops trusting TLS certificates under this root whose SCTs are dated after 2026-09-30 (sct_not_after). The CCADB lists EV policy OID 2.23.140.1.1 for this root, but Mozilla does not mark it as EV-enabled.

## Intermediate CAs issued by this root

The CCADB lists 2 intermediate CA certificates signed directly by OISTE WISeKey Global Root GC CA: 1 currently valid, 0 expired and 1 revoked (revoked includes those whose parent was revoked).

| Intermediate | Operated by | Expires | Status | SHA-256 |
|---|---|---|---|---|
| WISeKey CertifyID SSL GC CA 1 | WISeKey | 2039-02-16 | Valid | B05E05CFCBF81813EC30FA3F74920AA23FED367E147CC81E1121F64698449D0F |
| WISeKey CertifyID Advanced GC CA 1 | WISeKey | 2042-05-09 | Revoked | 387D496B92202D4C443CD94FF42DA17DF2F1E68E244C2FBBA7E294DBDD11357B |

## Cross-signed versions

No certificate in the CCADB has the same subject and public key as OISTE WISeKey Global Root GC CA with a different issuer, so a client has to carry OISTE WISeKey Global Root GC CA itself in its root store to trust it.


## What happens when it expires

OISTE WISeKey Global Root GC CA is valid until 2042-05-09, about 15.5 years after this data snapshot (2026-11-10). From that day, browsers and operating systems that check trust-anchor expiry stop accepting chains that end at this root, so any certificate that can only chain to it fails validation. Android is a known exception: it does not enforce the expiry date of trust anchors. Root programs can stop trusting it before it expires: Chrome 2026-09-30.

## FAQ

**Is OISTE WISeKey Global Root GC CA trusted by Chrome, Firefox, Safari and Windows?**

Yes. As of 2026-11-10, Chrome, Mozilla (Firefox), Apple (Safari) and Microsoft (Windows) all trust it for TLS server authentication. Distrust-after dates already set: Chrome 2026-09-30.

**When does OISTE WISeKey Global Root GC CA expire?**

On 2042-05-09, about 15.5 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has OISTE WISeKey Global Root GC CA issued?**

The CCADB lists 2: 1 valid, 0 expired and 1 revoked. The newest valid one is WISeKey CertifyID SSL GC CA 1, valid until 2039-02-16.

**Is OISTE WISeKey Global Root GC CA cross-signed?**

No. The CCADB has no certificate with the same subject and public key signed by another CA.

Sources: CCADB TLS Server Authentication report, All Included Root Certificate Trust Bit Settings, All Certificate Information (V5), the per-store TLS reports and Mozilla's Included CA Certificate Report (ccadb.org/resources).