Root certificate · OISTE

OISTE Server Root RSA G1

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.

Data updated Nov 10, 2026

Root store status

Root store	Status	Trusted for TLS	Distrust for TLS after	Constrained
Chrome	Included Included	Yes	—	No
Mozilla	Included Included	Yes	—	No
Apple	Not included Not included	No	—	No
Microsoft	Not included Not included	No	—	No

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

Included Chrome

Status: Included

Included Mozilla

Status: Included
Trust bits: Websites
EV policy OIDs: 2.23.140.1.1
First included in: 3.117 / 145

Not included Apple

Status: Not included

Not included Microsoft

Status: Not included

"Trusted for TLS" means the store includes the root with the server-authentication trust bit (Mozilla "Websites", Apple serverAuth, Microsoft Server Authentication EKU). Microsoft "NotBefore" means only certificates issued before a cutoff date are still trusted. "Constrained" means the store applies extra restrictions.

Details

CA owner: OISTE
Subject: CN=OISTE Server Root RSA G1,O=OISTE Foundation,C=CH
SHA-256: 9AE36232A5189FFDDB353DFD26520C015395D22777DAC59DB57B98C089A651E6
SHA-1 (Windows thumbprint): F700342594886831E434873F70FE86B3869FF06E
SPKI SHA-256: B964E141D3A55CAE180EA6A1A8D4A297DE26F11833C673569D196FB533A98710
Valid from: 2023-05-31
Expires: 2048-05-24
Key: RSA 4096
Signature algorithm: sha384WithRSAEncryption
Serial number: 55A5D9679428C6ED0CFA27DD5B014D18
Country: CH
Trust bits (CCADB): Server Authentication
EV policy OIDs (CCADB): 2.23.140.1.1 · TLS EV capable: Yes
Test websites: valid: https://rsag1evvalidssl.hightrusted.com/ · expired: https://rsag1evexpiredssl.hightrusted.com/ · revoked: https://rsag1evrevokedssl.hightrusted.com/
CCADB record: A011076
PEM: oiste-server-root-rsa-g1.pem

Look up this certificate on crt.sh

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directly by OISTE Server Root RSA G1: 3 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).

Showing 3 of 3: valid certificates first, newest first. Each name links to its crt.sh entry by SHA-256; an arrow marks a cross-certificate for another root on this site.

Intermediate	Operated by	Expires	Status
TuringSign RSA Secure CA 3	OISTE	2029-02-24	Valid
WISeKey CertifyID Server RSA CA 2	OISTE	2029-02-24	Valid
WISeKey CertifyID Server RSA CA 1	WISeKey	2039-02-16	Valid

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
OISTE WISeKey Global Root GB CA crt.sh	OISTE	2039-12-01	Valid

CRL and OCSP addresses

In the root certificate

OISTE Server Root RSA G1 itself contains no CRL Distribution Points and no OCSP (Authority Information Access) extension. That is normal for a root: clients trust it directly and do not check its own revocation status.

Full CRL this CA publishes (CCADB)

http://public.wisekey.com/crl/osrrsag1.crl

Used by the intermediates it issued

Addresses found in the CRL Distribution Points and OCSP fields of the 3 valid intermediates signed by OISTE Server Root RSA G1; the number in brackets is how many of them use each address.

CRL: http://public.wisekey.com/crl/osrrsag1.crl (3)
OCSP: http://ocsp.wisekey.com (1)

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.

Check whether your device trusts it

Each platform keeps its own root store. The commands below look up OISTE Server Root RSA G1 by common name (OISTE Server Root RSA G1) or fingerprint. The store status in each heading comes from the CCADB snapshot; your device can differ if it is out of date or managed by an administrator.

macOS (Apple store: Not included)

Search the system roots keychain by common name. -Z prints the SHA-256 hash, which must match the fingerprint on the last line.

security find-certificate -a -c "OISTE Server Root RSA G1" -Z \
  /System/Library/Keychains/SystemRootCertificates.keychain | grep "SHA-256"
# SHA-256 hash: 9AE36232A5189FFDDB353DFD26520C015395D22777DAC59DB57B98C089A651E6

Windows (Microsoft store: Not included)

Windows identifies roots by SHA-1 thumbprint. It installs third-party roots on demand through Automatic Root Certificates Update, so "not found" can also mean the root has not been needed yet; certutil -generateSSTFromWU roots.sst downloads Microsoft's full list.

certutil -verifystore Root F700342594886831E434873F70FE86B3869FF06E

Linux (ca-certificates follows Mozilla: Included · Trusted for TLS)

Debian, Ubuntu, Fedora and RHEL build their ca-certificates package from Mozilla's root store. Use trust list on p11-kit systems, or search the PEM bundle on Debian and Ubuntu.

# Fedora / RHEL / Arch (p11-kit)
trust list --filter=ca-anchors | grep -iF -A2 "OISTE Server Root RSA G1"
# Debian / Ubuntu (ca-certificates)
openssl crl2pkcs7 -nocrl -certfile /etc/ssl/certs/ca-certificates.crt \
  | openssl pkcs7 -print_certs -noout | grep -iF "OISTE Server Root RSA G1"

Java

Java ships its own cacerts keystore; JDK 9 and later accept -cacerts and the default store password is changeit. Search for the SHA-256 fingerprint in colon form.

keytool -list -cacerts -storepass changeit | grep -i "9A:E3:62:32:A5:18:9F:FD:DB:35:3D:FD:26:52:0C:01:53:95:D2:27:77:DA:C5:9D:B5:7B:98:C0:89:A6:51:E6"

Android

Android's system store is maintained by Google separately from the four CCADB stores above. Open Settings → Security & privacy → More security settings → Encryption & credentials → Trusted credentials → System (menu names vary by vendor and version) and look for OISTE Foundation → OISTE Server Root RSA G1.

Which root does my site chain to?

List the chain your server sends and compare the last issuer with this root; the fingerprint check confirms a local copy.

Download PEM

# show subject (s:) and issuer (i:) of every certificate the server sends
openssl s_client -connect example.com:443 -servername example.com -showcerts </dev/null 2>/dev/null \
  | grep -E '^ *[0-9]+ s:|^ *i:'
# subject and SHA-256 fingerprint of the downloaded PEM file
openssl x509 -in oiste-server-root-rsa-g1.pem -noout -subject -fingerprint -sha256
# sha256 Fingerprint=9A:E3:62:32:A5:18:9F:FD:DB:35:3D:FD:26:52:0C:01:53:95:D2:27:77:DA:C5:9D:B5:7B:98:C0:89:A6:51:E6

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.

Other roots from OISTE

OISTE Server Root ECC G1 ECDSA P-384 · 2048-05-24
OISTE WISeKey Global Root GB CA RSA 2048 · 2039-12-01
OISTE WISeKey Global Root GC CA ECDSA P-384 · 2042-05-09

Sources

CCADB — Resources (TLS Server Authentication report, All Included Root Certificate Trust Bit Settings)
CCADB — All Certificate Information (root and intermediate), CSV V5
CCADB — Mozilla Included CA Certificate Report
CCADB — Chrome / Mozilla / Apple / Microsoft TLS Server Authentication CSV