Root certificate · Atos
Atos TrustedRoot Root CA RSA TLS 2021
Atos TrustedRoot Root CA RSA TLS 2021 is a root CA certificate operated by Atos (RSA 4096, valid until 2041-04-17, SHA-256 81A9088E). As of the latest CCADB data it is trusted for TLS server authentication by 4 of 4 major root stores: Chrome, Mozilla, Apple, Microsoft.
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 | Included Included | Yes | — | No |
| Microsoft | Included Included | Yes | — | No |
The CCADB lists no EV policy OID for Atos TrustedRoot Root CA RSA TLS 2021.
Included Chrome
- Status
- Included
Included Mozilla
- Status
- Included
- Trust bits
- Websites
- EV policy OIDs
- not EV-enabled
- First included in
- NSS 3.92 / Firefox 117
- Inclusion bug
- #1782092
Included Apple
- Status
- Included
- Trust bits
- serverAuth
Included Microsoft
- Status
- Included
- Trusted EKUs
- Server Authentication, Client Authentication
"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
- Atos
- Subject
- C=DE,O=Atos,CN=Atos TrustedRoot Root CA RSA TLS 2021
- SHA-256
81A9088EA59FB364C548A6F85559099B6F0405EFBF18E5324EC9F457BA00112F- SHA-1 (Windows thumbprint)
18523B0D0637E4D63ADF23E498FB5B16FB867448- SPKI SHA-256
F7CA77A610E3D42447240692DBD57CFD13CF042ACD2062E6A62B87B9ED81C1A7- Valid from
- 2021-04-22
- Expires
- 2041-04-17
- Key
- RSA 4096
- Signature algorithm
- sha384WithRSAEncryption
- Serial number
53D5CFE619930BFB2B0512D8C22AA2A4- Country
- DE
- Trust bits (CCADB)
- Server Authentication, Client Authentication
- EV policy OIDs (CCADB)
- not EV-enabled · TLS EV capable: No
- Test websites
- valid:
https://tls-rsa-root-2021-pki-valid.atos.net· expired:https://tls-rsa-root-2021-pki-expired.atos.net· revoked:https://tls-rsa-root-2021-pki-revoked.atos.net - CCADB record
- A010381
- PEM
- atos-trustedroot-root-ca-rsa-tls-2021.pem
Intermediate CAs issued by this root
The CCADB lists 1 intermediate CA certificates signed directly by Atos TrustedRoot Root CA RSA TLS 2021: 1 currently valid, 0 expired and 0 revoked (revoked includes those whose parent was revoked).
Showing 1 of 1: 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 |
|---|---|---|---|
| Atos TrustedRoot Server CA RSA 2022 | Atos | 2032-07-09 | Valid |
Cross-signed versions
No certificate in the CCADB has the same subject and public key as Atos TrustedRoot Root CA RSA TLS 2021 with a different issuer, so a client has to carry Atos TrustedRoot Root CA RSA TLS 2021 itself in its root store to trust it.
CRL and OCSP addresses
In the root certificate
Atos TrustedRoot Root CA RSA TLS 2021 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://pki-crl.atos.net/crl/Atos_TrustedRoot_Root_CA_RSA_TLS_2021.crl
Used by the intermediates it issued
Addresses found in the CRL Distribution Points and OCSP fields of the 1 valid intermediates signed by Atos TrustedRoot Root CA RSA TLS 2021; the number in brackets is how many of them use each address.
- CRL:
http://pki-crl.atos.net/crl/Atos_TrustedRoot_Root_CA_RSA_TLS_2021.crl(1) - CRL:
ldap://pki-ldap.atos.net/cn=Atos%20TrustedRoot%20Root%20CA%20RSA%20TLS%202021,ou=CA,ou=Atos%20TC,o=Atos,dc=atos,dc=net?certificateRevocationList(1) - OCSP:
http://pki-ocsp.atos.net(1)
What happens when it expires
Atos TrustedRoot Root CA RSA TLS 2021 is valid until 2041-04-17, about 14.4 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 Atos TrustedRoot Root CA RSA TLS 2021 by common name (Atos TrustedRoot Root CA RSA TLS 2021) 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: Included · Trusted for TLS)
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 "Atos TrustedRoot Root CA RSA TLS 2021" -Z \
/System/Library/Keychains/SystemRootCertificates.keychain | grep "SHA-256"
# SHA-256 hash: 81A9088EA59FB364C548A6F85559099B6F0405EFBF18E5324EC9F457BA00112FWindows (Microsoft store: Included · Trusted for TLS)
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 18523B0D0637E4D63ADF23E498FB5B16FB867448Linux (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 "Atos TrustedRoot Root CA RSA TLS 2021"
# Debian / Ubuntu (ca-certificates)
openssl crl2pkcs7 -nocrl -certfile /etc/ssl/certs/ca-certificates.crt \
| openssl pkcs7 -print_certs -noout | grep -iF "Atos TrustedRoot Root CA RSA TLS 2021"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 "81:A9:08:8E:A5:9F:B3:64:C5:48:A6:F8:55:59:09:9B:6F:04:05:EF:BF:18:E5:32:4E:C9:F4:57:BA:00:11:2F"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 Atos → Atos TrustedRoot Root CA RSA TLS 2021.
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.
# 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 atos-trustedroot-root-ca-rsa-tls-2021.pem -noout -subject -fingerprint -sha256
# sha256 Fingerprint=81:A9:08:8E:A5:9F:B3:64:C5:48:A6:F8:55:59:09:9B:6F:04:05:EF:BF:18:E5:32:4E:C9:F4:57:BA:00:11:2FFAQ
Is Atos TrustedRoot Root CA RSA TLS 2021 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.
When does Atos TrustedRoot Root CA RSA TLS 2021 expire?
On 2041-04-17, about 14.4 years after the 2026-11-10 data snapshot.
How many intermediate certificates has Atos TrustedRoot Root CA RSA TLS 2021 issued?
The CCADB lists 1: 1 valid, 0 expired and 0 revoked. The newest valid one is Atos TrustedRoot Server CA RSA 2022, valid until 2032-07-09.
Is Atos TrustedRoot Root CA RSA TLS 2021 cross-signed?
No. The CCADB has no certificate with the same subject and public key signed by another CA.
Other roots from Atos
- Atos TrustedRoot 2011 RSA 2048 · 2030-12-31
- Atos TrustedRoot Root CA ECC TLS 2021 ECDSA P-384 · 2041-04-17
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