www.zkse.de

Issued by R3

About this certificate

This digital certificate with serial number 03:c7:ef:9c:f2:71:05:04:5c:a2:00:33:ce:c2:73:f7:93:c3 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=www.zkse.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:c7:ef:9c:f2:71:05:04:5c:a2:00:33:ce:c2:73:f7:93:c3
Serial Number (int): 329371549219147479641831907505026505348035
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 15:de:b3:76:9b:6b:03:5c:d1:ae:75:4c:09:24:4e:58:2e:88:df:a5
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 46:54:6e:91:17:02:3d:ad:70:26:8c:78:1f:a1:7d:6a:b3:59:d7:ab
Fingerprint (sha256): 18:9e:82:a2:40:3f:72:05:5e:22:49:5f:18:79:df:61:5e:fc:14:c8:5b:78:ce:1d:9a:fc:e9:bb:04:d6:6f:01

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

Revocation information

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

Check the revocation status for certificate www.zkse.de

4

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.zkse.de

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

www.zkse.de
www.zkse.uni-due.de
www.zkse.uni-duisburg-essen.de
zkse.de

Other certificates including the domain name zkse.de

(limited to 100 certificates)
www.zkse.de
www.zkse.de
www.zkse.de
www.zkse.de
www.zkse.de

Certificate

The complete raw certificate details for www.zkse.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwlWA1St8BTjAGakVi1Cy
SfEdrbpsNdRtDLOgxiDF6kOhFiVVkqvcpylHBU1FGvS7OkgbrCoPjM2YPKbqLdU8
jkJrkKryUvXo7MZ1OWNGQblgjD+4BL1MBHutVo5GCuiqT0DbzItxU82waZlv5EfI
hoVE3Bo20oCxZR/vwFhHJOpgIZgHEkXk8CMI7WMIepR4brOeg3JN7umzNP/+TRVW
RYyllT0DUePVvzWUQ4x2MQK6iXJ3ohcAFMSXERkhJTVBVY4d86GRmQ3CxYZBhG8b
gmaMCP8+3g0r88sM+yiHo6tk/xSq7OrimWTD9xDyhNLe1d3d1LP4bCh9JTPrFXAw
dwIDAQAB
-----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 329371549219147479641831907505026505348035
 . . . . . . . . [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 2023-10-05 13:27:14 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-03 13:27:13 +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 'www.zkse.de'
 . . . . . . . . [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 24532394388773548766100721381151999651087923525279795681760865626460710078291827823372380484640801262312268978463113469415701669635910553738634196878331505580078958981818308533354349976516475116622010770460268095846081947703972901988918892724092716427322716941211093253649158530377202463938790035140556421471029410306806536974516379438124040949280205574272420278782162642231536237075750937917629892822206140708911513009583887658927372052610060895454208160428397072483245904799088290731365883974008023093294755156427978603087952069645254609855538839762697045737559071412384688483393442145028305369232218395019888832631
 . . . . . . . . . . . . . . . . . . . . [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)
							15deb3769b6b035cd1ae754c09244e582e88dfa5
 . . . . . . . . . . . . . . . . [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 (77 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.uni-due.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.zkse.uni-duisburg-essen.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zkse.de'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007700dab6bf6b3fb5b6229f9bc2bb5c6be87091716cbb51848534bda43d3048d7fbab0000018b003c4e5a0000040300483046022100d5a382a0b42ed584e2d8f5e57189b46d148d190ef2ac4eb07565e8eb993ab30e022100b3fedce174a7434ab4cbd7a6caa65bcb589db3f31da7e8d35a55d00b638384f20076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018b003c4e720000040300473045022100cc3cc7d7484fb6e84e3f1540c4b93b014000c0cf7b657ae857ad0ea6bc29ee56022066d816dec05e707cf6e505aeebfe7093131acfc7cceca468fed46c71e271084c
 . . . . [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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