# OISTE Server Root RSA G1 root certificate (OISTE)

> OISTE Server Root RSA G1 is a root CA certificate operated by OISTE (RSA 4096, valid until 2048-05-24, SHA-256 9AE36232). As of the latest CCADB data it is trusted for TLS server authentication by 2 of 4 major root stores: Chrome, Mozilla.

Source: https://ssl.sh/roots/oiste-server-root-rsa-g1/
Last updated: 2026-11-10

OISTE Server Root RSA G1 is a root CA certificate operated by OISTE (RSA 4096, valid until 2048-05-24, SHA-256 9AE36232). As of the latest CCADB data it is trusted for TLS server authentication by 2 of 4 major root stores: Chrome, Mozilla.

| Field | Value |
|---|---|
| CA owner | OISTE |
| Subject | CN=OISTE Server Root RSA G1,O=OISTE Foundation,C=CH |
| SHA-256 | 9AE36232A5189FFDDB353DFD26520C015395D22777DAC59DB57B98C089A651E6 |
| SPKI SHA-256 | B964E141D3A55CAE180EA6A1A8D4A297DE26F11833C673569D196FB533A98710 |
| Valid from | 2023-05-31 |
| Expires | 2048-05-24 |
| Key | RSA 4096 |
| Signature algorithm | sha384WithRSAEncryption |
| Serial number | 55A5D9679428C6ED0CFA27DD5B014D18 |
| SHA-1 (Windows thumbprint) | F700342594886831E434873F70FE86B3869FF06E |

## Root store status

| Root store | Status | Trusted for TLS | Distrust for TLS after | Details |
|---|---|---|---|---|
| Chrome | Included | Yes | - | - |
| Mozilla | Included | Yes | - | Trust bits: Websites; EV policy OIDs: 2.23.140.1.1; First included in: 3.117 / 145 |
| Apple | Not included | No | - | - |
| Microsoft | Not included | No | - | - |

Mozilla treats it as an EV root for policy OID 2.23.140.1.1.

## Intermediate CAs issued by this root

The CCADB lists 3 intermediate CA certificates signed directly by OISTE Server Root RSA G1: 3 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).

| Intermediate | Operated by | Expires | Status | SHA-256 |
|---|---|---|---|---|
| TuringSign RSA Secure CA 3 | OISTE | 2029-02-24 | Valid | EAF9DF32DA5800A0A3804EB4F0106733030CC8C2AEDBE0E5B0EBD034A7CE8402 |
| WISeKey CertifyID Server RSA CA 2 | OISTE | 2029-02-24 | Valid | E5B02775C1430090A66450502C3A91AAE1264C2582FEE57C9E5CF9CE4D94C07D |
| WISeKey CertifyID Server RSA CA 1 | WISeKey | 2039-02-16 | Valid | AE70FF8A3E11C7F95C3BAB3C8FB55EF4CB06EB4559469E9B90ED6EF7FC6DDE4E |

## Cross-signed versions

1 certificate(s) in the CCADB have the same subject and public key as OISTE Server Root RSA G1 but a different issuer. A server can send one of them so that clients which trust the issuing root, but not OISTE Server Root RSA G1, can still build a chain.

| Signed by | CA owner | Expires | Status | SHA-256 |
|---|---|---|---|---|
| OISTE WISeKey Global Root GB CA | OISTE | 2039-12-01 | Valid | 16921390648AC0CBD2BF2702699236A39F3B6048A35D2F0893DD9045883910C8 |

## What happens when it expires

OISTE Server Root RSA G1 is valid until 2048-05-24, about 21.5 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.

## FAQ

**Is OISTE Server Root RSA G1 trusted by Chrome, Firefox, Safari and Windows?**

As of 2026-11-10, Chrome, Mozilla trust it for TLS server authentication; Apple, Microsoft do not.

**When does OISTE Server Root RSA G1 expire?**

On 2048-05-24, about 21.5 years after the 2026-11-10 data snapshot.

**How many intermediate certificates has OISTE Server Root RSA G1 issued?**

The CCADB lists 3: 3 valid, 0 expired and 0 revoked. The newest valid one is TuringSign RSA Secure CA 3, valid until 2029-02-24.

**Is OISTE Server Root RSA G1 cross-signed?**

Yes. The CCADB has 1 cross-certificate(s) with its subject and key, signed by OISTE WISeKey Global Root GB CA; 1 of them are still valid.

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).