computingfrontiers.org

Issued by R3

About this certificate

This digital certificate with serial number 04:9c:97:e0:d1:5c:17:ba:cc:ca:c8:2c:5c:a5:4d:6e:c9:65 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=computingfrontiers.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:9c:97:e0:d1:5c:17:ba:cc:ca:c8:2c:5c:a5:4d:6e:c9:65
Serial Number (int): 401735073714887163082022508201823846713701
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 07:75:c5:e3:a6:92:ee:86:b8:bc:3a:1b:82:2c:94:82:4d:f0:3d:fe
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 16:b6:c4:5c:cb:29:a0:36:ed:00:63:c4:6e:f1:0c:8f:c4:58:41:4d
Fingerprint (sha256): f7:28:a9:75:ff:c9:df:ec:fc:e3:bc:34:ac:ba:35:da:ca:1e:94:cf:ae:3e:32:c4:29:d2:f7:a5:dc:52:56:12

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6zOuoUyfE69w4Tz6Tq0e
cYm6/c36MGUK0InUCWsA+Dot7sfvAHp6a2iVqNJCdbXhUoJbxryTE1s/yUF8fCF/
ol5h/QTLXJeC/0we10YWacCyS53W4rVNqFJF9t+XHWhFna4dUZFi55OejujpzEBn
DEeB6ZaNxEcyaj8+F7HsQBEuzuhuHUP5JIXD1UJ4MwoPGpVvb3nrZn9OPTCufmTR
TOBMWTFQ7kGOxNJbxHcidXnRK29vL2Zsr/cT8Z2pq86a9luw1ZzeHK6KCTVqgviK
7eTZB2svrS57ynNscVutw5tBrknCyE/HaKWObZ9l0jjUnOI1hEPwLaq8u6wnagIE
gwIDAQAB
-----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 401735073714887163082022508201823846713701
 . . . . . . . . [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 2023-06-20 07:55:25 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-09-18 07:55:24 +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 29691487084418054390543240459902659438892782717001725013877087164374636441886894262919580579838013851477202918642936172332293080884491646209328561257579550839281460060017175412863916941644094572483609733416260006370146339805474890515281230433197659681252465417132726291701861292135498369225762673689220666693909158599029447176516876305913443490354817680361983178729011714682299826482051498448729341962191084673567068086161396831607147784871110094585821804245487934025666922581011001730013509975664207010760197552136363178920065232782973044592359731232146026634998613523962322727236168466176892921707606178409339815043
 . . . . . . . . . . . . . . . . . . . . [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)
							0775c5e3a692ee86b8bc3a1b822c94824df03dfe
 . . . . . . . . . . . . . . . . [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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb49900000188d804137700000403004730450220371ed7cdffde639187b3f8ae834d4a754090d59dc9457a07db6bf83732be2500022100af5f5a88d42e3f6812c246237b8aa9eb5707f887ddddce11b135f2d765be8cf2007600e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e00000188d80413a60000040300473045022100f46d815e02fc38fea5757484a901f5e2a803ace5fca7cbc8afdf611b028afe33022033f80dfbe7e9683605fd3303f27d1a37b188907c8c583f855d4fe8caa201f7ba
 . . . . [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)
		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