computingfrontiers.org

Issued by R3

About this certificate

This digital certificate with serial number 04:0f:0e:75:2c:4d:c7:50:fa:f9:06:fb:14:80:2f:08:47:7e was issued on by Let's Encrypt.

With 4 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.


We have idenified some issues with this certificate:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=computingfrontiers.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:0f:0e:75:2c:4d:c7:50:fa:f9:06:fb:14:80:2f:08:47:7e
Serial Number (int): 353572596820116777425976640986002905122686
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 61:43:8c:b4:c2:03:69:6f:db:f6:d0:9d:63:24:ba:1f:80:c4:82:8e
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 96:ea:47:f6:ed:47:aa:82:c2:3a:a5:5b:ab:0e:14:27:c3:f6:d0:a5
Fingerprint (sha256): 29:6e:d6:6e:07:4e:fb:4a:6d:06:82:c3:a2:b8:85:dd:05:57:0c:3b:77:1b:4f:68:df:9f:02:6a:59:03:85:a3

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate computingfrontiers.org

4

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for computingfrontiers.org

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA256 with RSA

Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Server Authentication
Client Authentication

Extensions

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

cf19.liacs.nl
computingfrontiers.org
ischia.liacs.nl
www.computingfrontiers.org

Other certificates including the domain name computingfrontiers.org

(limited to 100 certificates)
computingfrontiers.org
cf19.liacs.nl
cf19.liacs.nl
computingfrontiers.org
cf19.liacs.nl
cf19.liacs.nl
computingfrontiers.org
cf19.liacs.nl
computingfrontiers.org

Certificate

The complete raw certificate details for computingfrontiers.org in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAowKxPF4oyBd/dV74c0GV
PVqMsGvDrBTdauUoA4ir2e91SgwaJtFKAXtz/TdTzt3WR4Bb1Aio20SDWCoqrxC8
IuDFjYbhgcOEmgiwFhAQ0+v0XOl/96d6SZKs27XJnIx8QVBGY4UeBRSirlP9+R8X
aKBh69JQBNT+P6RAi8QhfEfMERdF9/4KSZiQRAaV4h0FKJul5an7aasHsYB/dfhG
EgS7hAH+j2jo7Fz1TGQVRHJvdMEir/DZsqge48bMbCW6Ip/orh6aCHyTHVJx/wfB
DJhwOOVRWmpO12GMSt1fn3YziyFB+SAlzaCqogeVsKfDh/mWe3gCoUk6BSHvnDpT
LQIDAQAB
-----END PUBLIC KEY-----

ASN.1 decoded

 [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2
 . . . . . . . . [c:0|t:2|false] INTEGER 353572596820116777425976640986002905122686
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-02-15 21:06:47 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-15 21:06:46 +0000 UTC
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'computingfrontiers.org'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption)
 . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 20578171345585080182814401560455775165744044675136507560168595255137911920657028191236360058367255025071717959206202129524085860142395776277403479195361386460811018167141851994731692387611597636600930648283987925484450704238458336002329313186905005098871302479180583835100620782972864712606262192130534703518022281871134440623727622457343795631205190487563579928954429721666286166117943309999283088785172553613899996885858927710900378111890802084911173323053535209183895656881633555786406538728227007765121113257883908662909500465015997767322083820330369540994707530375179293645873913638927107259076414967807842341677
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537

 . . . . . . . . [c:2|t:3|true] ORAddress 
 . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits)
							05a0
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							61438cb4c203696fdbf6d09d6324ba1f80c4828e
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (73 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.o.lencr.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r3.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (86 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cf19.liacs.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'computingfrontiers.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ischia.liacs.nl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.computingfrontiers.org'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef00750076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018daeced6f70000040300463044022005be2250396e5c364523ad2744e2cfdffb412c925848ae861fb1eeef3ecb64a302205de36724271bb6e7aaf1412329b5d23f4c09186896071ea0beec4ee40b6f34d5007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018daeced6fb000004030047304502207d83d42c0d80d8c9579e46285a73e7694abd3e0b96b73ffbb1f9500fd45c18d1022100de08478c1901a7a740dc43c10eb4a16591ea2c6c3bef50b7f1e35874d25fc94a
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption)
 . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		003a3c96d3e84483a8fd2b1cb929313cdef16b49ef8372bbbacd5dbde8494ec42500a6af9ce4ebbfe31dae375c5ecc3a989d36901edad459a88da8b220f45b72b1666fd7284574ff00d774ec2346a782acdd82eb54cf43838225d2393c4d74abc530fedaa29ef030ef11b825579339e1810bb219a835599dd9fe0ce20a8d7e04d7f9c9b0d969ed428e7b6de90a06168b494708f0942a2f232009073774843120985812f7bc7de4808724b27d6a0fbdfe1f930295c9098e64e7dfa6392295b1690f83051778116dc3e199609b658cdac6e9fad00b093bb47817020f470682cc3d022749365d0fdd5b28335f91f342b3ce18a9bffb7c9f097c4bcb2262fa967aa2ee